All Tables

Table 1: Reference star astrometry from GSC-II. Both right ascension, $\alpha$ , and declination, $\delta$ , are given in degrees. The rightmost column quotes the names of the stars as they appear in GSC-II.
Table 2: Statistics of the field star aperture photometry. For each star the mean magnitude and standard deviation are tabulated, along with the mean of the individual formal errors, and reference magnitude.
Table 3: Time delay results for the D²_4,2 dispersion estimate applied to the complete aperture photometry data set. A 5th order polynomial was used to model additional variability in the quasar light curves. As noted in the text, other polynomials gave very similar results. Estimated errors are 1 $\sigma$ limits.
Table 4: Time delay results for the D²_4,2 dispersion estimate applied to the RES photometry data. A 5th order polynomial was used to model additional variability in the quasar light curves. Estimated errors are 1 $\sigma$ limits.