Database User's Guide:
This interface allows to interactively select and filter two keywords from a QC1 database table, and plot the content. It is intended as quick-look tool for visualization, trending analysis and data selection.
Panel 1 is for selecting X and Y axis parameter. Default choices are marked blue. X default is always mjd-obs. The other listed options are the numerical (integer or float) entries of the QC1 table selected.
Panel 2 lists all filter options. These are mostly instrument keywords which can be used to filter the output. E.g., it is generally not useful to plot all mean bias values if there are multiple CCDs and read-out modes.
All possible (non-NULL) choices which exist in the database are listed, including 'any'. Proper selection may require expert knowledge. E.g., some 20 or so different values for slit width exist for UVES wave calibration frames, and random selection may give useless results.
Panel 3 has the plot options. You can select:
After selection, data can be plotted ('plot'). There is also a button to download the selected data set ('Get Data'). This makes sense if the interface has been used to select and plot a sample which is intended for further analysis.
The output has some summary information about the table plotted, the selected keys, time ranges, and filter values.
Let us look at the output of the QC1 plotter. In addition to the above selection, we have filtered 'chip = B' and 'bin = 1x1', but otherwise left all default choices (date fields were default at the time of creating the plot).
This is the graphical output:
It has the mean bias values plotted versus MJD-OBS.
The output can be fine-tuned by setting
This brings the plot to a reasonable scaling. The mean value is given in the plot (190.161) and as red line. The 1-sigma error bar is also indicated (0.923) and plotted as broken blue lines. The 'mark outliers' option turns all those data points into red asterisks which are outside the (mean +/- 1 sigma) range.