Checking the quality of the data using the OST

At this stage of the process, it is already possible to make a preliminary statistical analysis of the observing run without having to inspect the files individually. One can, for instance, plot the r.m.s noise of the flat field exposures against their mean pixel value to check the general consistency of the frames. Or one may want to plot the mean temperature of the detector against the date of the exposures to check whether there are outliers.( Figure 15.1)

  

Figure 15.1: Trend analysis of the detector mean temperature with Modified Julian Date