MLAMBDA/PIimages, commonly known as banana plots, are improved by overruling the default y-range by checking the
withyrangesbox and setting, e.g. yimagemin=0, yimagemax=2500.
Fig. 36 shows plots of the merged RGS1 events. These
plots are orthogonal projections of the all-important
MLAMBDA,XDSP_CORR,PI 3-D RGS data space of the merged list of
all the events detected in the observation, thus showing all the
features of RGS data. The edges are clear of the 9 CCDs, numbered
1-9 from right to left. In both plots, wavelength and dispersion angle
increase from left to right.
The pointing coordinates were evidently chosen well enough to put this
bright source central in the aperture. The source was bright enough to
be seen up to 4th or even a weak 5th order in the characteristic
hyperbolic-shaped areas occupied by photons that have passed through the
gratings. There are plenty of hot pixels and columns and the so-called
fixed pattern noise shows as the herring-bone pattern in CCDs 1 and
2. Calibration sources of F K at
PIeV span CCDs
2&3 and 7&8 ; and Al K at
PIeV span CCDs 3&4
The locations of the selection regions may be checked using the task rgsimplot
which plots them over
that are, in this case, most usefully generated from the screened events
files. Fig. 37 shows such an example.