This file contains extinction data as determined by the CARLSBERG AUTOMATIC MERIDIAN CIRCLE (CAMC) on the island of La Palma in the Canary Islands. The nightly values derived use approximately 50 photo-electric standard stars as they cross the north - south meridian. EXTINCTION EXT HOURLY EXT' NO. OF IN JOHNSON V MEAN RATE MEAN STARS DATE UT AT ZENITH ERROR OF EXT ERROR USED 1998 1 8 1 21 0.15 0.009 -0.006 0.001 205 1998 1 16 1 25 0.11 0.008 0.000 0.000 273 1998 1 18 1 26 0.12 0.007 0.000 0.000 287 1998 1 19 1 59 0.12 0.010 0.000 0.000 260 1998 1 23 1 26 0.12 0.007 0.000 0.000 291 1998 1 24 2 23 0.13 0.010 0.000 0.000 214 1998 1 25 1 49 0.13 0.008 0.004 0.001 274 1998 2 10 1 30 0.12 0.008 0.000 0.000 190 1998 2 11 1 29 0.12 0.009 0.000 0.000 138 1998 2 19 1 29 0.19 0.008 -0.002 0.001 245 1998 2 20 1 28 0.22 0.016 0.013 0.002 155 1998 3 6 1 34 0.12 0.008 0.000 0.000 213 1998 3 6 21 28 0.12 0.018 0.000 0.000 62 1998 3 10 1 25 0.11 0.014 0.000 0.000 214 1998 3 11 1 27 0.12 0.008 0.000 0.000 164 1998 3 16 1 24 0.18 0.009 0.006 0.001 279 1998 3 17 1 23 0.39 0.009 0.000 0.000 289 1998 3 18 0 27 0.30 0.009 -0.020 0.001 221 1998 3 19 1 23 0.20 0.007 -0.013 0.001 277 1998 3 20 1 23 0.13 0.009 0.000 0.000 191 1998 3 30 1 19 0.14 0.010 0.000 0.000 250 1998 4 1 1 20 0.14 0.007 0.001 0.001 237 1998 4 2 1 19 0.15 0.015 0.011 0.001 128 1998 4 23 1 13 0.17 0.008 0.005 0.001 212 1998 4 24 2 28 0.18 0.021 0.017 0.003 85 1998 4 25 1 12 0.17 0.013 0.018 0.001 183 1998 4 26 1 13 0.16 0.007 0.000 0.000 227 1998 4 28 1 12 0.11 0.036 0.019 0.002 90 1998 5 1 1 17 0.14 0.019 -0.007 0.002 112 1998 5 3 0 55 0.14 0.009 0.000 0.000 192 1998 5 4 1 11 0.15 0.008 0.000 0.000 220 1998 5 5 1 12 0.15 0.007 0.004 0.001 234 1998 5 6 1 11 0.16 0.011 -0.004 0.001 99 1998 5 7 1 12 0.15 0.008 0.000 0.000 194 1998 5 13 1 12 0.17 0.006 0.004 0.001 264 1998 5 14 1 11 0.17 0.008 0.000 0.000 274 1998 5 15 1 12 0.14 0.009 -0.003 0.001 235 1998 5 16 1 11 0.14 0.007 0.000 0.000 257 1998 5 17 2 3 0.14 0.008 -0.001 0.001 203 1998 5 18 22 44 0.14 0.009 -0.003 0.002 90 1998 5 22 1 11 0.17 0.008 -0.003 0.001 217 1998 5 23 1 12 0.16 0.008 -0.005 0.001 209 1998 5 24 1 8 0.16 0.009 0.000 0.000 168 1998 5 25 23 38 0.18 0.022 0.000 0.000 69 1998 5 28 1 12 0.14 0.009 0.000 0.000 213 At this point the scanning slit micrometer was removed and replaced by the CCD camera. Measures of extinction, this time in the SDSS r' band resumed on 1999 Mar 26.