NONE NONE ( 0 Ma - 0 Ma ) 0.0 0.0 NONE SingleAge SSR.NMM000007 Deprecated zircon MIT Isotope Lab Noah McLean NONE NONE ID-TIMS NONE 0.0000 0.0000 0.0000 concordia http://www.geochronportal.org/uploadimages/19962-concordia-tempConcordia.svg weighted mean 206Pb/238U (Th-corrected) 47196800.74370445311069488525390625 ABS 10109.643124065010852064006030559539794921875 0.7532425435876615171792991532129235565662384033203125 20219.28624813002170412801206111907958984375 29142.05724675808960455469787120819091796875 58222.734519434787216596305370330810546875 z1 z2 z6 Explanation Comment true Matt 3-24 TPBs 1 0 Unknown Lab 2016-01-20 No reference No comment r206_204b 18.24118194 ABS 0.212257 r207_204b 15.33876157 ABS 0.15474647 r208_204b 37.35406617 ABS 0.4968847 rhoR207_204b__r208_204b 0.892 rhoR206_204b__r207_204b 0.778 rhoR206_204b__r208_204b 0.873 ET535 3 0 mixed 205-233-235 EARTHTIME 2012-07-09 No reference EARTHTIME-supplied model r204_205t 0.00009 ABS 0.000009 r206_205t 0.000388739872278295 ABS 0.00016886001521521 r207_205t 0.000296068587594844 ABS 0.000140143894670955 r208_205t 0.000744376162255465 ABS 0.000347037829188955 r233_235t 0.9950621757 ABS 0.0000538364810724104 r238_235t 0.0030799297 ABS 0.000000395548132250173 concPb205t 0.0000000000103116 ABS 0.000000000000025779 concU235t 0.00000000103356161714094 ABS 0.00000000000259506527095644 rhoR206_205t__concU235t -0.000625524583951292 rhoR204_205t__r207_205t 0.989936347334727 rhoR207_205t__concU235t -0.000637072197103421 rhoR233_235t__concU235t 0.0329317147303595 rhoR204_205t__r206_205t 0.981367466390299 rhoR238_235t__concU235t -0.0213714959352477 rhoR233_235t__r238_235t -0.593855080520382 rhoR206_205t__r208_205t 0.988226606955946 rhoR208_205t__concU235t -0.000564938004436441 rhoR204_205t__r208_205t 0.975476664128529 rhoConcPb205t__concU235t 0.995699056887309 rhoR204_205t__concU235t -0.000601507547689546 rhoR207_205t__r208_205t 0.992617413594994 rhoR206_205t__r207_205t 0.992109313058621 MIT Daly 0.0025 ABS 0.00020 false H20FG z1 z1 true January 23, 2016 12:56 PM zircon loose grain 1 0.0 0.0000 0.0000 false false true true First grain from left in image. Matt 3-24 TPBs v.1.0 ET535 v.3.0 false MIT Daly false #NONE# 05-48A Plag Pbc final 1 0 Unknown Lab 2012-07-11 Stacey, J. C. and Kramers, J., 1975. EPSL 26, pp. 207-221 No comment r206_204c 17.89 ABS 0.05000000000000000000 r207_204c 15.59 ABS 0.0500000000000000000 r208_204c 37.76 ABS 0.10000000000000000000 rhoR206_204c__r208_204c 0.5 rhoR207_204c__r208_204c 0.5 rhoR206_204c__r207_204c 0.5 NONE NONE alphaPb 0.0025 ABS 0.00020 alphaU 0.000950934780707659 ABS 0 ar231_235sample 1.10000 ABS 0.10000 pbBlankMassInGrams 0.00000000000070000 ABS 0.00000000000010000 r18O_16O 0.002 ABS 0.000020 r18O_16O_revised 0.002050 ABS 0.022000 r238_235b 137.8180 ABS 0.02200 r238_235s 137.8180 ABS 0.01000 r265_267m 0.981909813180335 PCT 0.00575838903462806 r270_265m 1.5522358606078 PCT 0.00547775687345261 r270_267m 1.52412806437393 PCT 0.00535782395930011 rTh_Umagma 4.00000 ABS 0.50000 tracerMassInGrams 0.01160 ABS 0.00010 uBlankMassInGrams 0.00000000000010000 ABS 0.00000000000005000 r204_205m 0.000314959755102041 PCT 0.703763676398942 false false r206_204m 3616.29848796594 PCT 0.657101709022988 false false r206_205m 1.13975462896 PCT 0.035057169718095 false false r206_207m 19.939650877449 PCT 0.0620188010676817 false false r206_208m 15.51696119766 PCT 0.0617298230873601 false false r207_204m 181.289977428688 PCT 0.64983373599478 false false r207_205m 0.0571632636326531 PCT 0.075669803576957 false false r208_204m 233.022252913271 PCT 0.647177606025018 false false r208_205m 0.07345317482 PCT 0.0794930439278916 false false r233_235m 0.985781607717417 PCT 0.00575838903462806 false true r238_233m 1.5522358606078 PCT 0.00547775687345261 false true r238_235m 1.53013789402859 PCT 0.00535782395930012 false true r206_238r 0.00733142778868710 ABS 0.0000029432256838436085 r206_238r_Th 0.00734761318190920 ABS 0.000002945259518731345 r207_206r 0.0471955477702329 ABS 0.00004888963656724146 r207_206r_Pa 0.0471909476278652 ABS 0.000049104925441766374 r207_206r_Th 0.0470915849621643 ABS 0.00004877657899055779 r207_206r_ThPa 0.0470869949530345 ABS 0.00004899141873718145 r207_235r 0.0476865096020720 ABS 0.000046337430822100976 r207_235r_Pa 0.0476818616057343 ABS 0.000046569962047955196 r208_206r 0.0570112117319551 ABS 0 rhoR206_238r__r207_235r 0.034658664866644345 ABS 0 rhoR206_238r__r207_235r_Pa 0.034485608641697967 ABS 0 rhoR206_238r_Th__r207_235r 0.03438751025909015 ABS 0 rhoR206_238r_Th__r207_235r_Pa 0.034215807952217264 ABS 0 rhoR207_206r__r238_206r 0.35539270985260035 ABS 0 rhoR207_206r_Pa__r238_206r 0.35379693182178296 ABS 0 rhoR207_206r_Pa__r238_206r_Th 0.01252776683259371193202014183043502271175384521484375 ABS 0 rhoR207_206r_Th__r238_206r 0.356009950216034709580270600781659595668315887451171875 ABS 0 rhoR207_206r_Th__r238_206r_Th 0.35509937166032834 ABS 0 rhoR207_206r_ThPa__r238_206r 0.01251720005824017399598258037940468057058751583099365234375 ABS 0 rhoR207_206r_ThPa__r238_206r_Th 0.35350458089554343 ABS 0 age206_238r 47089015.36352505 ABS 18835.163150954017 age206_238r_Th 47192592.9024684 ABS 18847.875830643527 age207_206r 58060925.7124248 ABS 2475768.5245103524 age207_206r_Pa 57828527.7271211 ABS 2486968.6510802456 age207_206r_Th 52800730.2206478 ABS 2477947.5453384644 age207_206r_ThPa 52568102.3049761 ABS 2489160.1932341726 age207_235r 47301019.5368232 ABS 44908.70270544282 age207_235r_Pa 47296514.8427773 ABS 45134.26450070857 bestAge 47089015.36352505 ABS 18835.163150954017 percentDiscordance 18.8972363328196000 NONE 0 massPb_rib 0.000000000031384287325392679882222973900833492800000000000 ABS 0 massU 0.0000000044520067122470709481794971500 ABS 0 radToCommonTotal 77.5276191523167 ABS 0 rTh_Usample 0.178024805542823 ABS 0 totCommonPbMass 0.000000000000399659223903349430330434366479486334634328000 ABS 0 totRadiogenicPbMass 0.000000000030984628101489330451892539534354006465365672000 ABS 0 r206_204tfc 5095.25481864458 ABS 0 r207_206s 0.0471955477702329 ABS 0 r235_207s 20.9702913537742 ABS 0 r238_206s 136.399079254803 ABS 0 r238_207s 2890.08361379445 ABS 0 false H20FG z2 z2 true January 23, 2016 12:56 PM zircon loose grain 1 0.0 0.0000 0.0000 false false true true Second grain from left in image. Matt 3-24 TPBs v.1.0 ET535 v.3.0 false MIT Daly false #NONE# 05-48A Plag Pbc final 1 0 Unknown Lab 2012-07-11 Stacey, J. C. and Kramers, J., 1975. EPSL 26, pp. 207-221 No comment r206_204c 17.89 ABS 0.05000000000000000000 r207_204c 15.59 ABS 0.0500000000000000000 r208_204c 37.76 ABS 0.10000000000000000000 rhoR206_204c__r208_204c 0.5 rhoR207_204c__r208_204c 0.5 rhoR206_204c__r207_204c 0.5 NONE NONE alphaPb 0.0025 ABS 0.00020 alphaU 0.000946240511810781 ABS 0 ar231_235sample 1.10000 ABS 0.10000 pbBlankMassInGrams 0.00000000000070000 ABS 0.00000000000010000 r18O_16O 0.002 ABS 0.000020 r18O_16O_revised 0.002050 ABS 0.022000 r238_235b 137.8180 ABS 0.02200 r238_235s 137.8180 ABS 0.01000 r265_267m 0.988605595954567 PCT 0.00419861195082577 r270_265m 0.602991522640324 PCT 0.00532110414217890 r270_267m 0.596120735731978 PCT 0.00513147908258710 rTh_Umagma 4.00000 ABS 0.50000 tracerMassInGrams 0.01200 ABS 0.00010 uBlankMassInGrams 0.00000000000010000 ABS 0.00000000000005000 r204_205m 0.000353700469387755 PCT 0.465683526103712 false false r206_204m 1258.59139488588 PCT 0.479496164675736 false false r206_205m 0.444723952483333 PCT 0.0170535931428561 false false r206_207m 17.82677954578 PCT 0.0835970490302669 false false r206_208m 10.7453047457536 PCT 0.0465727617782246 false false r207_204m 70.5938197411429 PCT 0.47013785304882 false false r207_205m 0.02494568242 PCT 0.0865395972626496 false false r208_204m 116.987457330531 PCT 0.509774542398933 false false r208_205m 0.0413642528676471 PCT 0.0486964797122809 false false r233_235m 0.992530480704085 PCT 0.00419861195082577 false true r238_233m 0.602991522640324 PCT 0.0053211041421789 false true r238_235m 0.598487407733553 PCT 0.00513147908258711 false true r206_238r 0.00733027060780604 ABS 0.0000026570431691823005 r206_238r_Th 0.00734627620105118 ABS 0.000002656996400353225 r207_206r 0.0470734786121154 ABS 0.00011047145897436336 r207_206r_Pa 0.0470688777435538 ABS 0.00011056818023179214 r207_206r_Th 0.0469709179499950 ABS 0.0001102780319175679 r207_206r_ThPa 0.0469663271055094 ABS 0.00011037449706948476 r207_235r 0.0475556632982301 ABS 0.00012235323032855106 r207_235r_Pa 0.0475510153018924 ABS 0.0001224414833370877 r208_206r 0.0706062551426353 ABS 0 rhoR206_238r__r207_235r 0.6638644207225585 ABS 0 rhoR206_238r__r207_235r_Pa 0.6633859224979962 ABS 0 rhoR206_238r_Th__r207_235r 0.6624776941831448 ABS 0 rhoR206_238r_Th__r207_235r_Pa 0.6620001954792172 ABS 0 rhoR207_206r__r238_206r -0.5732873528355505 ABS 0 rhoR207_206r_Pa__r238_206r -0.5728009503455995 ABS 0 rhoR207_206r_Pa__r238_206r_Th -0.04332227332277749365374575063469819724559783935546875 ABS 0 rhoR207_206r_Th__r238_206r -0.57302670793817889194343706549261696636676788330078125 ABS 0 rhoR207_206r_Th__r238_206r_Th -0.5718611023267101 ABS 0 rhoR207_206r_ThPa__r238_206r -0.0436317639846301175143850059612304903566837310791015625 ABS 0 rhoR207_206r_ThPa__r238_206r_Th -0.571376356991582 ABS 0 age206_238r 47081609.98400265 ABS 17003.75861629125 age206_238r_Th 47184037.0296286 ABS 17003.18915323706 age207_206r 51882884.8579957 ABS 5604245.892216317 age207_206r_Pa 51649576.5583611 ABS 5609942.404250699 age207_206r_Th 46674215.5918893 ABS 5612145.57740086 age207_206r_ThPa 46440678.4513009 ABS 5617846.201745772 age207_235r 47174199.7148537 ABS 118595.5085152099 age207_235r_Pa 47169694.4581419 ABS 118681.57767980399 bestAge 47081609.98400265 ABS 17003.75861629125 percentDiscordance 9.2540630443627000 NONE 0 massPb_rib 0.000000000013047619314512580427537220073037680000000000000 ABS 0 massU 0.00000000178342114501112280337685165700 ABS 0 radToCommonTotal 25.9183275440500 ABS 0 rTh_Usample 0.220482288190811 ABS 0 totCommonPbMass 0.000000000000484711366007455504509340847949585324922800000 ABS 0 totRadiogenicPbMass 0.000000000012562907948505124923027879225088094675077200000 ABS 0 r206_204tfc 1694.89929319762 ABS 0 r207_206s 0.0470734786121154 ABS 0 r235_207s 21.0279897418068 ABS 0 r238_206s 136.420611666791 ABS 0 r238_207s 2898.03549023632 ABS 0 false H20FG z3 z3 true January 23, 2016 12:56 PM zircon loose grain 1 0.0 0.0000 0.0000 false false true true Third grain from left in image Matt 3-24 TPBs v.1.0 ET535 v.3.0 false MIT Daly false #NONE# 05-48A Plag Pbc final 1 0 Unknown Lab 2012-07-11 Stacey, J. C. and Kramers, J., 1975. EPSL 26, pp. 207-221 No comment r206_204c 17.89 ABS 0.05000000000000000000 r207_204c 15.59 ABS 0.0500000000000000000 r208_204c 37.76 ABS 0.10000000000000000000 rhoR206_204c__r208_204c 0.5 rhoR207_204c__r208_204c 0.5 rhoR206_204c__r207_204c 0.5 NONE NONE alphaPb 0.0025 ABS 0.00020 alphaU 0.000874352763897055 ABS 0 ar231_235sample 1.10000 ABS 0.10000 pbBlankMassInGrams 0.00000000000070000 ABS 0.00000000000010000 r18O_16O 0.002 ABS 0.000020 r18O_16O_revised 0.002050 ABS 0.022000 r238_235b 137.8180 ABS 0.02200 r238_235s 137.8180 ABS 0.01000 r265_267m 0.982027177443061 PCT 0.00788574485069876 r270_265m 1.51467583117598 PCT 0.00789864653757111 r270_267m 1.48745243942964 PCT 0.00594023958821877 rTh_Umagma 4.00000 ABS 0.50000 tracerMassInGrams 0.01260 ABS 0.00010 uBlankMassInGrams 0.00000000000010000 ABS 0.00000000000005000 r204_205m 0.000303699306122449 PCT 0.624303347463003 false false r206_204m 5205.24256603545 PCT 0.622661334309238 false false r206_205m 1.57817745293258 PCT 0.0132597606361181 false false r206_207m 20.265802102076 PCT 0.0450066282494916 false false r206_208m 22.3358606156087 PCT 0.0452291301206794 false false r207_204m 256.646990906225 PCT 0.652677307049878 false false r207_205m 0.0778789588607595 PCT 0.0516043485961543 false false r208_204m 232.81962058502 PCT 0.665604168437844 false false r208_205m 0.0706470675 PCT 0.0515918655823613 false false r233_235m 0.985899899424956 PCT 0.00788574485069876 false true r238_233m 1.51467583117598 PCT 0.00789864653757113 false true r238_235m 1.49331835627137 PCT 0.00594023958821878 false true r206_238r 0.0104203299583831 ABS 0.0000031799984945748032 r206_238r_Th 0.0104367447522476 ABS 0.000003180352075245775 r207_206r 0.0473467402166191 ABS 0.00004251713362807354 r207_206r_Pa 0.0473435036961133 ABS 0.000042640458273772 r207_206r_Th 0.0472722738001973 ABS 0.000042462763712254333 r207_206r_ThPa 0.0472690423700543 ABS 0.000042585857887731265 r207_235r 0.0679950813652175 ABS 0.00007069667301595346 r207_235r_Pa 0.0679904333688798 ABS 0.00007084930095265316 r208_206r 0.0395971557178143 ABS 0 rhoR206_238r__r207_235r 0.5712512906534736 ABS 0 rhoR206_238r__r207_235r_Pa 0.5700206658673825 ABS 0 rhoR206_238r_Th__r207_235r 0.5709078605213532 ABS 0 rhoR206_238r_Th__r207_235r_Pa 0.5696779755736482 ABS 0 rhoR207_206r__r238_206r -0.3210434643970112 ABS 0 rhoR207_206r_Pa__r238_206r -0.32013814299364607 ABS 0 rhoR207_206r_Pa__r238_206r_Th -0.01294260669778229087822918330630272976122796535491943359375 ABS 0 rhoR207_206r_Th__r238_206r -0.321136945288373942819504236467764712870121002197265625 ABS 0 rhoR207_206r_Th__r238_206r_Th -0.3210481201130924 ABS 0 rhoR207_206r_ThPa__r238_206r -0.0129937656584393178282876846196813858114182949066162109375 ABS 0 rhoR207_206r_ThPa__r238_206r_Th -0.32014329158159655 ABS 0 age206_238r 66826188.91085789 ABS 20288.177886685644 age206_238r_Th 66930913.3481185 ABS 20290.1040846432 age207_206r 65680926.9155426 ABS 2144851.1314130593 age207_206r_Pa 65518177.3311406 ABS 2151244.924444105 age207_206r_Th 61932275.9651318 ABS 2146989.2493309104 age207_206r_ThPa 61769411.8335412 ABS 2153385.8744671997 age207_235r 66795080.5342117 ABS 67213.98342984651 age207_235r_Pa 66790661.4998313 ABS 67359.38569739072 bestAge 66826188.91085789 ABS 20288.177886685644 percentDiscordance -1.743675141473000 NONE 0 massPb_rib 0.000000000046335171643618477494039595827271711200000000000 ABS 0 massU 0.0000000047168357312669191780793989200 ABS 0 radToCommonTotal 111.365520396254 ABS 0 rTh_Usample 0.123854755260299 ABS 0 totCommonPbMass 0.000000000000412361118252456529925580020246674281766212000 ABS 0 totRadiogenicPbMass 0.000000000045922810525366020964114015807025036918233788000 ABS 0 r206_204tfc 7428.07235336522 ABS 0 r207_206s 0.0473467402166191 ABS 0 r235_207s 14.7069461484834 ABS 0 r238_206s 95.9662509722645 ABS 0 r238_207s 2026.88190429168 ABS 0 false H20FG z6 z6 true January 23, 2016 12:56 PM zircon loose grain 1 0.0 1.0000 0.5000 false false true true NONE Matt 3-24 TPBs v.1.0 ET535 v.3.0 false MIT Daly false #NONE# 05-48A Plag Pbc final 1 0 Unknown Lab 2012-07-11 Stacey, J. C. and Kramers, J., 1975. EPSL 26, pp. 207-221 No comment r206_204c 17.89 ABS 0.05000000000000000000 r207_204c 15.59 ABS 0.0500000000000000000 r208_204c 37.76 ABS 0.10000000000000000000 rhoR206_204c__r208_204c 0.5 rhoR207_204c__r208_204c 0.5 rhoR206_204c__r207_204c 0.5 NONE NONE alphaPb 0.0025 ABS 0.00020 alphaU 0.000859688715701921 ABS 0 ar231_235sample 1.10000 ABS 0.10000 pbBlankMassInGrams 0.00000000000100000 ABS 0.00000000000030000 r18O_16O 0.002 ABS 0.000020 r18O_16O_revised 0.002050 ABS 0.022000 r238_235b 137.8180 ABS 0.02200 r238_235s 137.8180 ABS 0.01000 r265_267m 0.986718362325729 PCT 0.00443859491651144 r270_265m 0.84518271306350000000 PCT 0.00451414012244611 r270_267m 0.833957238666531 PCT 0.00510223319950213 rTh_Umagma 4.00000 ABS 0.50000 tracerMassInGrams 0.01200 ABS 0.00010 uBlankMassInGrams 0.00000000000010000 ABS 0.00000000000001000 r204_205m 0.00060262535 PCT 0.721611598141185 false false r206_204m 1043.95588638721000000000 PCT 0.71942305794617100000 false false r206_205m 0.626853888133334 PCT 0.0152942465497096 false false r206_207m 16.89946438556670000000 PCT 0.07561384805846400000 false false r206_208m 7.41669176462857000000 PCT 0.05529711786793950000 false false r207_204m 61.30915835984210000000 PCT 0.78052701944477300000 false false r207_205m 0.0370936379333333 PCT 0.0777275770199097 false false r208_204m 140.04149284488900000000 PCT 0.76685913886466000000 false false r208_205m 0.0845129977428572 PCT 0.0566365863378263 false false r233_235m 0.99062824665056400000 PCT 0.00443859491651144000 false true r238_233m 0.84518271306350000000 PCT 0.00451414012244611000 false true r238_235m 0.83726180505501800000 PCT 0.00510223319950214000 false true r206_238r 0.00733521999311234 ABS 0.000002635635014334813 r206_238r_Th 0.00735076327998313 ABS 0.0000026374575977893805 r207_206r 0.0471031039682910 ABS 0.00018621012647143878 r207_206r_Pa 0.0470985062041315 ABS 0.00018626774972275103 r207_206r_Th 0.0470035038275169 ABS 0.0001858765433402931 r207_206r_ThPa 0.0469989157853909 ABS 0.0001859340204851465 r207_235r 0.0476177218186346 ABS 0.00019781997961962436 r207_235r_Pa 0.0476130738222969 ABS 0.0001978745769588992 r208_206r 0.105558699772566 ABS 0 rhoR206_238r__r207_235r 0.5875890697875009 ABS 0 rhoR206_238r__r207_235r_Pa 0.5874269428468358 ABS 0 rhoR206_238r_Th__r207_235r 0.5849087555267015 ABS 0 rhoR206_238r_Th__r207_235r_Pa 0.5847473681354484 ABS 0 rhoR207_206r__r238_206r -0.5265303479735398 ABS 0 rhoR207_206r_Pa__r238_206r -0.5263763367818046 ABS 0 rhoR207_206r_Th__r238_206r_Th -0.5236736618053075 ABS 0 rhoR207_206r_ThPa__r238_206r_Th -0.523520639572339 ABS 0 age206_238r 47113283.51767877 ABS 16866.674169689988 age206_238r_Th 47212751.5893826 ABS 16878.077312163434 age207_206r 53384384.5008818 ABS 9434962.053722205 age207_206r_Pa 53151446.0829468 ABS 9439215.580332741 age207_206r_Th 48330914.8800113 ABS 9446994.027448235 age207_206r_ThPa 48097754.8626305 ABS 9451251.598828038 age207_235r 47234350.5075232 ABS 191733.1586875863 age207_235r_Pa 47229845.5176932 ABS 191786.927000984 bestAge 47113283.51767877 ABS 16866.674169689988 percentDiscordance 11.7470699378382000 NONE 0 massPb_rib 0.00000000001913889008241485136811169116490880000000 ABS 0 massU 0.00000000250236376895865004551614672600 ABS 0 radToCommonTotal 19.3031705232808 ABS 0 rTh_Usample 0.329650071189651 ABS 0 totCommonPbMass 0.00000000000094265524000151114224021439248479600000 ABS 0 totRadiogenicPbMass 0.00000000001819623484241334022587147677242400400000 ABS 0 r206_204tfc 1228.74036215414 ABS 0 r207_206s 0.0471031039682910 ABS 0 r235_207s 21.0005846942611 ABS 0 r238_206s 136.328562870505 ABS 0 r238_207s 2894.25858139368 ABS 0 EARTHTIME Physical Constants Model 1 0 EARTHTIME 2008-01-01 See individual constants for reference. This Physical Constants Model is the accepted default as of 2008. We certify it as D2 for the U-series work. lambda230 0.0000091577 PCT 0.15244 Cheng et al. 2000 lambda231 0.0000211887 PCT 0.33578 Robert et al. 1969 lambda232 0.0000000000493343 PCT 0.042769 Holden 1990 lambda234 0.0000028262 PCT 0.100842120161347 Cheng et al. 2000 lambda235 0.00000000098485 PCT 0.068031 Jaffey et al. 1971 lambda238 0.000000000155125 PCT 0.053505 Jaffey et al. 1971 gmol235 235.043922 gmol204 203.973028 gmol205 204.9737 gmol238 238.050785 gmol206 205.974449 gmol207 206.975880 gmol208 207.976636