Workflow information system for QC

This plot shows the mean signal-to-noise ratio of XSHOOTER IDPs as a function of the mean counts. Ideally, if photon-noise dominated, the points should follow a square-root law (indicated by the dotted lines which are NOT fits).

For the UVB and VIS arm we display correlations for the two detector gain values offered (low gain = lg or high gain = hg) and the two mostly used binnings (1x1 binning or 2x2). For the various possible slit widths we have decided to display reference slit widths (thought to be representative). These are indicated on the plots and in the 'remarks'. The complete data set (all modes and slit widths) is plotted with small dots. The NOD values in plot #1 are for datancom=2 only.

Within each box we use different colors for the 3 observing techniques:

• red for STARE (single exposure),
• green for NODDING (exposure pairs, or multiple pairs),
• blue for OFFSET (OBJECT and SKY exposures).

In the NIR-arm, the left box is for the STARE and OFFSET mode observations including the mapping template observations which are processed by the STARE pipeline recipe. The right box displays the NODDING data, broken down by the reference slit width and the most frequently used values of N (PRO.DATANCOM, the total number of combined raw frames).