This file contains extinction data as determined by the CARLSBERG MERIDIAN TELESCOPE (CMT) on the island of La Palma in the Canary Islands. The nightly values are derived from CCD frames in the SDSS r' band. Each frame contains an average of 30 - 40 photometric standard stars. Explanation of data columns: (1) Evening date ie. date before midnight. (2) Version number of data. If 0 then unchecked. (3) Extinction in r'. This is the median value of the extinction from all photometric frames. : indicates an uncertain value due to the night probably not being photometric. (4) Standard error on (3) = Scatter/sqrt(N_frames) (5) Scatter (robust estimate of the Gaussian sigma based on percentiles of the distribution). If this value is high (0.060), then the night was probably not photometric. (6) Number of photometric frames (7) Number of hours of photometric data taken. (8) Number of hours of non-photometric data taken. (9) Comment Evening Ext Error Scat Nf Phot Non-Phot Comment Date r' (1) (2) (3) (4) (5) (6) (7) (8) (9) 990326 1 0.085 0.008 0.024 8 6.76 0.00 990327 1 0.089 0.004 0.013 13 9.25 0.10 990328 1 0.095 0.009 0.031 11 8.92 0.00 990329 1 0.096 0.009 0.030 11 8.69 0.62 990330 1 0.116 0.004 0.012 10 6.74 0.82 990331 1 0.115 0.005 0.016 10 6.00 0.10 990401 1 0.087 0.006 0.026 17 8.13 0.71 990402 1 0.109 0.007 0.024 11 8.57 0.76 990403 1 0.101 0.019 0.050 7 4.81 4.39 Cirrus second half? 990404 1 0.099 0.005 0.017 11 9.24 0.00 990405 1 0.348 0.013 0.038 8 6.76 2.51 990406 1 0.389: 0.045 0.120 7 3.45 5.31 Cirrus? 990407 1 0.129 0.008 0.021 7 6.48 0.01 990408 1 0.096 0.007 0.023 11 9.13 0.00 990409 1 0.097 0.008 0.024 10 9.17 0.00 990410 1 0.111 0.010 0.022 5 4.57 0.00 990411 1 0.32 0.00 Techmical problem 990412 1 0.101 0.004 0.015 13 8.93 0.00 990413 1 0.095 0.005 0.014 9 8.13 0.95 990414 1 0.111 0.007 0.021 10 6.23 2.66 Cloud at first 990415 0 0.00 0.00 Rain + high humidity 990416 1 0.112 0.005 0.021 17 6.92 1.37 990417 1 0.116 0.003 0.005 4 2.87 0.44 Camera driver problem 990418 1 0.096 0.006 0.023 14 8.72 0.00 990419 1 0.111 0.004 0.015 12 6.58 0.70 990420 1 0.097 0.003 0.012 13 8.16 0.49 990421 1 0.113 0.009 0.030 10 4.27 1.03 990422 1 0.117 0.009 0.028 9 4.59 3.94 990423 1 0.096 0.006 0.020 11 5.32 1.53 990424 1 0.094 0.008 0.029 12 8.11 0.48 990425 1 0.093 0.007 0.026 13 8.15 0.32 990426 1 0.102 0.012 0.038 11 4.39 2.17 990427 1 0.39 0.00 Rain 990428 1 0.103 0.006 0.022 12 6.25 0.03 990429 0 0.00 0.00 High humid + rain 990430 0 0.00 0.00 " " " 990501 1 0.102 0.006 0.017 7 3.15 0.44 990502 1 0.086 0.005 0.021 15 8.25 0.00 990503 1 0.095 0.007 0.024 13 6.64 1.53 990504 1 0.086 0.006 0.020 11 5.63 0.31 990505 1 0.084 0.003 0.011 13 7.78 0.43 990506 1 0.107 0.008 0.025 9 3.82 0.56 990507 1 0.102 0.013 0.032 6 3.20 0.00 990508 1 0.092 0.005 0.017 13 7.60 0.53 990509 1 0.088 0.005 0.015 11 5.19 1.31 990510 1 0.080 0.009 0.031 11 5.59 1.71 990511 1 0.114: 0.059 0.118 4 0.91 1.51 990512 2 0.82 7.17 Cloud? 990513 1 0.367: 0.022 0.062 8 3.76 1.74 990514 1 0.150: 0.015 0.034 5 2.55 4.98 990515 1 0.133 0.007 0.021 8 3.81 1.53 990516 1 0.090 0.006 0.025 19 6.94 0.56 990517 1 0.088 0.006 0.023 13 6.94 0.00 990518 1 0.089 0.006 0.023 13 6.30 0.83 990519 1 0.111 0.011 0.034 9 4.00 0.93 990520 1 0.121 0.008 0.031 14 6.87 0.54 990521 1 0.100 0.009 0.023 7 2.56 0.52 990522 0 0.00 0.00 Comms problem 990523 1 0.087 0.009 0.031 13 5.94 1.69 990524 1 0.091 0.011 0.036 11 5.97 0.00 990525 1 0.093 0.008 0.026 11 5.29 1.49 990526 0 0.00 0.00 Tech. problem 990527 0 0.00 5.19 Cloudy 990528 1 0.209: 0.017 0.034 4 2.27 3.36 990529 1 0.107 0.007 0.013 4 2.60 2.53 990530 1 0.086 0.010 0.029 8 3.87 1.16 990531 1 0.099 0.011 0.022 4 1.87 0.03 990601 1 0.085 0.006 0.023 14 7.62 0.00 990602 1 0.069 0.007 0.023 13 6.93 0.31 990603 1 0.100 0.004 0.013 10 5.15 0.29 990604 2 0.73 2.93 Mostly cloudy 990605 1 0.130 0.007 0.028 15 5.63 0.01 990606 1 0.105 0.013 0.037 8 3.64 0.50 990607 1 0.085 0.010 0.037 14 7.01 0.48 990608 1 0.092 0.007 0.026 12 6.34 0.59 990609 1 0.137 0.014 0.047 11 4.84 1.15 990610 1 0.202: 0.017 0.066 15 7.01 0.39 990611 1 0.091 0.007 0.026 13 6.58 0.00 990612 1 0.257 0.004 0.014 14 7.08 0.38 990613 1 0.42 0.00 Tech. problem 990614 2 0.84 0.00 Tech. problem 990615 1 0.560 0.006 0.020 10 4.55 0.00 990616 1 0.472 0.012 0.030 6 1.35 0.00 990617 1 0.400 0.024 0.054 5 1.80 1.40 990618 1 0.360 0.006 0.016 8 4.08 0.14 990619 1 0.217 0.001 0.002 3 1.06 0.00 990620 1 0.37 0.00 Tech. problem 990621 1 0.180 0.010 0.023 5 2.09 0.46 990622 2 0.49 0.86 Tech. problem 990623 1 0.097 0.012 0.031 6 3.02 0.13 990624 1 0.42 0.16 Tech. problems 990625 1 0.108 0.001 0.002 3 0.82 0.55 990626 0 0.00 0.54 Tech. problem 990627 2 0.63 0.34 Tech. problem 990628 1 0.13 0.03 Tech. problem 990629 1 0.067 0.004 0.009 5 2.76 0.01 990630 1 0.172 0.010 0.024 6 3.92 1.46 990701 1 0.494: 0.013 0.030 5 3.19 3.83 990702 1 0.53 0.00 Tech. problem 990703 2 2.74 0.00 Tech. problem 990704 1 0.108 0.009 0.017 4 5.05 0.00 990705 1 0.46 0.03 Tech. problem 990706 1 0.113 0.007 0.026 14 6.09 0.00 990707 1 0.177 0.008 0.016 4 1.86 0.00 990708 1 0.299 0.012 0.031 7 3.85 0.00 990709 2 1.06 4.29 Mostly cloudy 990710 1 0.477 0.006 0.019 11 5.15 0.00 990711 1 0.493 0.011 0.031 8 3.65 3.53 990712 1 0.399 0.006 0.021 11 5.05 0.00 990713 1 0.169: 0.022 0.067 9 4.35 0.00 990714 1 0.105 0.007 0.020 9 6.69 0.00 990715 1 0.096 0.007 0.022 9 4.83 0.00 990716 0 0.00 0.00 Tech. problem 990717 0 0.00 0.00 Cloudy? 990718 0 0.00 0.00 Tech. problem 990719 1 0.38 0.46 Tech. problem 990720 1 0.099 0.004 0.015 13 7.81 0.00 990721 1 0.093 0.003 0.009 11 7.88 0.00 990722 1 0.083 0.006 0.020 11 7.49 0.43 990723 1 0.099 0.004 0.011 8 6.64 0.00 990724 1 0.093 0.007 0.022 10 7.71 0.31 990725 1 0.099 0.007 0.020 9 4.62 0.00 990726 1 0.096 0.006 0.017 7 3.22 0.00 990727 0 0.00 2.32 Tech. problem 990728 1 0.097 0.005 0.017 13 8.02 0.00 990729 1 0.092 0.005 0.018 11 5.89 0.00 990730 1 0.094 0.010 0.032 11 5.15 0.00 990731 1 0.099 0.010 0.034 12 5.56 0.02 990801 1 0.123 0.008 0.023 8 3.91 0.00 990802 1 0.269 0.007 0.022 11 6.93 0.00 990803 1 0.117 0.007 0.026 14 8.15 0.00 990804 1 0.092 0.006 0.022 12 8.24 0.00 990805 1 0.115 0.005 0.016 11 6.98 0.00 990806 1 0.115 0.005 0.014 8 3.59 0.00 990807 0 0.00 0.00 Tech. problem 990808 0 0.00 0.00 Tech. problem 990809 0 0.00 7.78 Cloudy? 990810 1 0.247 0.007 0.016 5 2.57 2.30 990811 0 0.00 1.30 Tech. problem 990812 0 0.00 0.00 Cloudy 990813 0 0.00 0.00 No observer 990814 0 0.00 0.00 No observer 990815 0 0.00 0.00 No observer 990816 1 0.322 0.010 0.030 10 5.46 0.00 990817 0 0.00 0.00 Service 990818 0 0.00 0.00 Service 990819 1 0.090 0.005 0.017 12 8.32 0.00 990820 1 0.095 0.005 0.018 11 8.74 0.00 990821 1 0.147 0.011 0.030 7 4.27 4.24 990822 0 0.00 0.00 Tech. problem 990823 0 0.00 0.00 Tech. problem 990824 0 0.00 0.00 Tech. problem 990825 0 0.00 0.00 Tech. problem 990826 0 0.00 4.75 Tech. problem 990827 0 0.00 0.00 Tech. problem 990828 0 0.00 0.00 Tech. problem 990829 0 0.00 0.04 Tech. problem 990830 0 0.00 2.41 Tech. problem 990831 0 0.00 8.41 Tech. problem 990901 0 0.00 8.87 Tech. problem 990902 0 0.00 5.38 Tech. problem 990903 0 0.00 2.64 Tech. problem 990904 0 0.00 1.01 Tech. problem 990905 0 0.00 0.00 Tech. problem 990906 0 0.00 0.00 Tech. problem 990907 1 0.094 0.006 0.014 5 1.65 0.08 990908 1 0.096 0.010 0.029 8 4.38 0.00 990909 1 0.099 0.005 0.015 9 4.11 0.58 990910 1 0.099 0.007 0.015 5 1.74 0.02 990911 1 0.100 0.008 0.022 7 2.80 0.29 990912 0 0.00 0.00 Tech. problem 990913 0 0.00 0.00 High humidity 990914 1 0.097 0.007 0.019 8 3.66 0.39 990915 0 0.00 0.00 Tech. problem 990916 0 0.00 0.00 Tech. problem 990917 0 0.00 0.00 Tech. problem 990918 0 0.00 0.00 Tech. problem 990919 0 0.00 0.00 Tech. problem 990920 0 0.00 9.32 Cloudy? 990921 1 0.088 0.005 0.008 3 2.83 0.00 990922 1 0.102 0.009 0.021 5 4.06 0.12 990923 1 0.44 0.22 Tech. problem 990924 0 0.00 1.31 Cloudy? 990925 0 0.00 4.87 Cloudy? 990926 0 0.00 0.00 Rain 990927 1 0.091 0.008 0.029 13 7.44 0.79 990928 1 0.088 0.005 0.016 13 9.82 0.00 990929 1 0.103 0.008 0.027 10 6.25 0.00 990930 1 0.101 0.007 0.022 10 8.40 0.11 991001 1 0.39 0.00 No observer 991002 1 0.123 0.015 0.029 4 1.12 0.00 991003 1 0.108 0.006 0.018 10 10.10 0.00 991004 1 3.50 0.00 Tech. problem 991005 1 0.096 0.003 0.010 10 6.57 0.39 991006 1 0.101 0.004 0.012 9 5.43 0.07 991007 1 2.17 0.00 Tech. problem 991008 0 0.00 0.00 Tech. problem 991009 0 0.00 0.00 Tech. problem 991010 0 0.00 0.00 Tech. problem 991011 0 0.00 0.00 Tech. problem 991012 0 0.00 0.00 Tech. problem 991013 0 0.00 0.00 Tech. problem 991014 0 0.00 0.00 Tech. problem 991015 0 0.00 0.00 Tech. problem 991016 0 0.00 0.00 Tech. problem 991017 0 0.00 0.00 Tech. problem 991018 0 0.00 0.00 Tech. problem 991019 0 0.00 0.00 Tech. problem 991020 0 0.00 0.00 Tech. problem 991021 0 0.00 0.00 Tech. problem 991022 0 0.00 0.00 Tech. problem 991023 0 0.00 0.00 Tech. problem 991024 0 0.00 0.00 Tech. problem 991025 0 0.00 0.00 Tech. problem 991026 0 0.00 0.00 Tech. problem 991027 0 0.00 0.00 Tech. problem 991028 0 0.00 0.00 Tech. problem 991029 0 0.00 0.00 Tech. problem 991030 0 0.00 0.00 Tech. problem 991031 0 0.00 0.00 Tech. problem 991101 1 2.82 0.04 991102 1 0.172 0.014 0.056 16 7.09 0.90 991103 1 0.175: 0.038 0.076 4 2.47 0.95 991104 0 0.00 0.00 Software problem 991105 1 0.084: 0.005 0.010 4 2.90 3.95 991106 0 0.00 0.00 Cloudy 991107 0 0.00 0.00 Cloudy 991108 1 0.152: 0.008 0.016 4 2.11 4.15 991109 1 0.127 0.006 0.017 7 6.08 1.13 991110 2 1.34 0.00 Tech. problem 991111 1 0.127 0.015 0.039 7 7.74 0.66 991112 1 0.120 0.006 0.020 10 6.55 3.53 991113 0 0.00 0.00 High humidity 991114 0 0.00 0.00 Rain+High humidity 991115 0 0.00 0.00 Rain 991116 0 0.00 0.00 Rain+ice 991117 0 0.00 0.00 Rain 991118 0 0.00 0.00 Rain 991119 0 0.00 0.00 High humidity 991120 0 0.00 0.00 Rain 991121 0 0.00 0.00 Rain 991122 0 0.00 0.00 Rain+high humidity 991123 0 0.00 0.00 Rain+high humidity 991124 0 0.00 0.00 Rain/high humidity 991125 0 0.00 0.00 High humidity 991126 2 2.19 2.73 Tech. problem 991127 1 0.109 0.009 0.031 12 7.43 0.98 991128 2 0.93 1.36 High humidity+rain 991129 0 0.00 0.00 Rain 991130 0 0.00 0.00 Rain+high humidity 991201 0 0.00 0.00 Rain+snow 991202 0 0.00 0.00 Rain 991203 0 0.00 0.00 Rain 991204 0 0.00 0.00 Rain 991205 0 0.00 0.00 Rain 991206 0 0.00 0.00 Rain+high humidity 991207 1 0.62 0.35 High humidity 991208 1 0.51 0.30 High humidity 991209 1 0.129: 0.012 0.024 4 1.49 2.03 991210 1 0.090 0.006 0.020 10 7.69 0.00 991211 1 0.098 0.004 0.015 15 10.90 0.00 991212 1 0.092 0.008 0.014 3 1.24 0.00 991213 1 0.123: 0.016 0.027 3 1.12 1.97 991214 1 0.098 0.009 0.026 9 7.10 1.24 991215 1 0.107 0.006 0.015 6 4.90 0.21 991216 1 0.129: 0.031 0.076 6 3.62 0.00 991217 1 0.099 0.006 0.019 12 7.58 0.00 991218 1 0.090 0.005 0.020 16 10.71 0.00 991219 1 0.104 0.005 0.017 13 8.24 0.32 991220 1 0.077 0.005 0.015 8 3.71 0.89 991221 1 0.085 0.002 0.007 8 4.82 0.00 991222 0 0.00 0.00 Cloud 991223 1 0.108 0.001 0.003 3 6.79 0.00 991224 1 0.095 0.011 0.023 4 4.24 0.13 991225 1 0.099 0.008 0.021 7 3.49 0.46 991226 1 0.096 0.003 0.014 17 10.38 0.43 991227 1 0.52 0.04 Tech. problem 991228 1 0.60 0.00 Tech. problem 991229 1 0.109 0.003 0.013 14 9.12 1.64 991230 0 0.00 0.12 Rain 991231 2 1.40 0.37 Rain+tech. problem