# UT-date ZP measured mean ZP measured stddev 20090109 23.9408 0.0254 20090131 23.9232 0.0154 20090201 23.9340 0.0126 20090403 23.9872 0.0292 20090501 23.8885 0.0072 20090503 23.8925 0.0201 20090504 23.9973 0.0095 20090513 23.8817 0.0312 20090610 23.9062 0.0273 20090611 23.7702 0.0224 20090615 23.8347 0.0298 20090622 23.9440 0.0181 20090629 23.8566 0.0360 20090731 23.7725 0.0005 20090804 23.9055 0.0135 20090807 23.9243 0.0098 20090910 23.9550 0.0000 20090916 23.9138 0.0135 20090918 23.9179 0.0282 20090920 23.5029 1.3435 20091102 23.8877 0.0079 20091103 23.9045 0.0246 20091122 23.9290 0.0285 20091123 23.9498 0.0191 20091210 23.8603 0.0365 20091212 23.9615 0.0230 20091230 23.8117 0.0108 20100101 23.9560 0.0397 20100102 23.9666 0.0363 20100103 23.9410 0.0152 20100118 23.9710 0.0322 20100120 23.9987 0.0203 20100127 23.9513 0.0295 20100206 23.8982 0.0660 20100209 23.9108 0.0192 20100427 23.7873 0.0156 20100430 23.9013 0.0158 20100525 23.9155 0.0084 20100526 23.9029 0.0478 20100603 23.9680 0.0684 20100611 23.8807 0.0477 20100623 23.9693 0.0285 20100704 23.9335 0.0126 20100705 23.9490 0.0102 20100706 23.9155 0.0347 20100707 23.8853 0.0359 20100709 23.9305 0.0229 20100825 23.9868 0.0307 20100908 23.9856 0.0354 20100922 24.0048 0.0298 20100923 23.9669 0.0273 20100924 23.8864 0.0509 20100925 23.9655 0.0054 20100927 23.9904 0.0673 20100929 23.9795 0.0317 20100930 23.9858 0.0326 20101002 23.8785 0.0185 20101012 23.8610 0.0297 20101014 23.9705 0.0363 20101029 23.9502 0.0263 20101108 23.9593 0.0175 20110125 23.9642 0.0421 20110126 23.9536 0.0300 20110202 23.9198 0.0138 20110209 23.9217 0.0192 20110330 23.8833 0.0413 20110331 23.8475 0.0236 20110402 23.9170 0.0159 20110412 23.8190 0.0110 20110416 23.7498 0.0068 20110418 23.8257 0.0338 20110611 23.9795 0.0135 20110614 23.9085 0.0482 20110805 24.0000 0.0198 20110808 23.8852 0.0163 20110815 23.9285 0.0111 20110817 23.9518 0.0339 20110820 23.8725 0.0259 20111012 23.9352 0.0360 20111024 23.8456 0.0448 20120202 23.9355 0.0078 20120204 23.9477 0.0204 20120210 23.9423 0.0127 20120211 23.9513 0.0201 20120213 24.0075 0.0170 20120224 23.9745 0.0078 20120226 23.9615 0.0074 20120227 23.9255 0.0679 20120302 23.9235 0.0165 20120327 24.0143 0.0183 20120328 23.9872 0.0203 20120330 23.9925 0.0358 20120402 23.7632 0.0262 20120406 23.9635 0.0292 20120502 23.9398 0.0204 20120503 23.9442 0.0366 20120504 23.9782 0.0135 20120505 23.9383 0.0213 20120515 23.8478 0.0166 20120517 24.0035 0.0202 20120519 24.0045 0.0135 20120520 23.9735 0.0207 20120613 23.9520 0.0081 20120614 23.9645 0.0066 20120705 23.9178 0.0312 20120706 23.9189 0.0437 20120710 23.9995 0.0309 20120804 23.8810 0.0144 20120805 23.8628 0.0262 20120809 23.8813 0.0363 20120817 23.9062 0.0196 20120822 24.0487 0.0377 20120823 23.9826 0.0328 20120825 23.8923 0.0282 20120826 23.9773 0.0147 20120903 23.8803 0.0204 20120904 23.9352 0.0337 20120906 23.8993 0.0250 20120907 23.8920 0.0393 20120908 24.0175 0.0306 20120909 23.9018 0.0217 20120912 23.8963 0.0154 20120913 23.8256 0.0422 20120914 23.8566 0.0248 20120916 24.0240 0.0286 20120917 23.8577 0.0251 20120922 23.9763 0.0271 20121005 23.8275 0.0409 20121006 23.8695 0.0199 20121009 23.8980 0.0348 20130112 23.9365 0.0350 20130116 23.9225 0.0078 20130404 23.8965 0.0164 20130408 23.9564 0.0502 20130418 23.8910 0.0255 20130421 23.9551 0.0269 20130426 23.9104 0.0079 20130501 23.9183 0.0389 20130503 23.9327 0.0302 20130510 23.9193 0.0322 20130514 23.8083 0.0294 20130616 23.8668 0.0331 20130712 23.9454 0.0220 20130716 23.8942 0.0169 20130717 23.8912 0.0313 20130718 23.8925 0.0298 20130805 23.9247 0.0201 20130811 23.8912 0.0255 20130812 24.2330 0.1410 20130817 23.8487 0.0251 20130819 24.0068 0.0099 20130821 23.9065 0.0245 20130825 24.0385 0.0175 20130902 23.9636 0.0335 20131127 23.9646 0.0829 20140314 23.9922 0.0260 20140317 23.9830 0.0103 20140319 23.9503 0.0180 20140621 23.9970 0.0168 20140626 23.9087 0.0073 20140822 23.9428 0.0466 20140823 23.8883 0.0483 20140824 23.8767 0.0481 20140825 23.9029 0.0437 20140826 23.9032 0.0649 20140827 23.8428 0.0578 20140828 23.9033 0.0352 20140829 23.8964 0.0504 20140830 23.9002 0.0467 20140907 23.9672 0.0296 20141005 23.8667 0.0137 20141009 23.9740 0.0247 20141010 23.9854 0.0320 20141011 23.9670 0.0199 20141022 23.8813 0.0322 20141027 23.9021 0.0533 20141028 23.9485 0.0218 20141029 23.8922 0.0552 20141120 23.8612 0.0182 20141125 23.9670 0.0155 20141211 23.9630 0.0267 20141215 23.9238 0.0117 20150111 23.9606 0.0753 20150119 24.0377 0.0220 20150120 24.0272 0.0151 20150124 24.0512 0.0126 20150324 23.9967 0.0229 20150412 23.9440 0.0042 20150416 23.8779 0.0197 20150418 23.8933 0.0503 20150420 23.8536 0.0487 20150423 23.9047 0.0339 20150427 23.8501 0.0244 20150726 23.8390 0.0618 20150727 23.8682 0.0338 20150728 23.9118 0.0244 20150804 23.8907 0.0141 20150820 23.9910 0.0301 20150912 23.8967 0.0198 20150918 23.8615 0.0359 20150919 23.8200 0.0469 20151007 24.0378 0.0104 20151010 23.8303 0.0390 20151012 23.8666 0.0368 20151013 23.8748 0.0282 20151014 23.9033 0.0319 20151015 23.8624 0.0539 20151025 23.8608 0.0312 20151205 23.9270 0.0315 20151206 23.9536 0.0296 20151207 23.9019 0.0367 20151209 24.0092 0.0187 20160102 23.9530 0.0166 20160103 23.9554 0.0284 20160104 24.0474 0.0290 20160119 23.9177 0.0180 20160131 23.9360 0.0097 20160216 23.9440 0.0254 20160310 23.9918 0.0187 20160311 23.8950 0.0768 20160430 24.0127 0.0148 20160506 23.8801 0.0477 20160507 23.9406 0.0295 20160511 23.9092 0.0244 20160609 23.8076 0.0537 20160610 23.8356 0.0458 20160611 23.9463 0.0235 20160624 24.0065 0.0350 20161026 23.9002 0.0536 20161027 23.9794 0.0531 20161029 24.0209 0.0325 20161102 23.9430 0.0554 20161103 23.9846 0.0195 20161104 23.9127 0.0315 20161105 23.8378 0.0319 20161118 23.9835 0.0185 20161129 23.9225 0.0215 20161222 23.9820 0.0160 20161223 23.9037 0.0157 20170112 24.0328 0.0086 20170216 24.0168 0.0215 20170217 23.9548 0.0300 20170306 24.0055 0.0172 20170328 23.8575 0.0140 20170331 23.9935 0.0206 20170404 23.8143 0.0161 20170418 23.9560 0.0061 20170514 23.7797 0.0276 20170521 23.7859 0.0278 20170524 23.8965 0.0367 20170525 23.8509 0.0490 20170526 23.8854 0.0274 20170527 23.8638 0.0327 20170528 23.8277 0.0391 20170529 23.8043 0.0267 20170601 20.6070 0.0580 20170614 23.8685 0.0336 20170615 23.8727 0.1223 20170624 23.7170 0.0340 20170707 23.8950 0.0189 20170914 23.8260 0.0112 20170917 24.0180 0.0100 20170918 23.8855 0.0169 20170929 23.9475 0.0268 20171001 23.7502 0.0140 20171005 23.9527 0.0219 20171006 23.9375 0.0162 20171029 23.8889 0.0498 20171208 23.8485 0.0304 20171215 24.0040 0.0095 20171229 24.0728 0.0226 20180105 23.8513 0.0132 20180106 23.8853 0.0174 20180118 23.9815 0.0217 20180318 23.8022 0.0248 20180329 23.9156 0.0492 20180625 23.8322 0.0097 20180711 23.8879 0.0462 20180723 23.9602 0.0215 20181108 23.8713 0.0238 20181113 23.8552 0.0087 20181201 23.8541 0.0290 20181203 23.8001 0.0383 20181206 23.8520 0.0371 20181208 23.8549 0.0373 20190405 23.8059 0.0496 20190613 23.9565 0.0188 20190615 23.9055 0.0229 20190616 23.8875 0.0174 20190702 23.7136 0.0281 20190704 23.7532 0.0329 20191204 23.8485 0.0243 20200203 23.8868 0.0233 20200222 23.9140 0.0325