Bottom Line on the Comparison - The correlation is weak or non-existant at low values of the SkyProbe ZP or at fluxscale values close to 1.0. A typical plot is the one for queue run 04BQ03. There does seem to be a correlation at higher values of the ZP and at fluxscales bigger than 1.0. This can be seen in the plot for queue run 04BQ04 and to a lesser extent in 03BQ04.

Observations - We used our fluxscales for each image and extracted the corresponding SkyProbe zero point value using the imphotsearch command at cfht. We then plot the fluxscale value versus the zero point and look for a correlation.

Plots - We plot the full set for D1, g', chip 13, which includes a total of 175 points spanning 03BQ02 to 05BQ01. We then plot each individual queue run. The right-hand set of plots include an airmass correction. The bottom row for each set is zoomed up on low values of SkyProbe ZP and fluxscales close to 1.0.

Conclusion - We conclude that the SkyProbe zeropoint is not well enough correlated to be useful in calibrating or checking on the photometric zero points for each queue run.

ALL QUEUES
03BQ02
03BQ03
03BQ04
03BQ05
03BQ06
04BQ01
04BQ02
04BQ03
04BQ04
04BQ05
04BQ06
05BQ01