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Figure 12 shows the integrated line
intensity of the strongest lines in the E230 setup as a function of the
observation time or the source elevation. The intensities were corrected
for the gain-elevation-curve (Peñalver 2012). The correction amounts to
about 15% for the lowest elevations of 25.
The line intensities are relatively stable except between 44 and 54
where the intensities appear low compared to the remaining points. This
also corresponds to an observing time interval (8.5-9.25UT) between two
pointing observations. An error in the pointing correction could explain
this difference.