Figure 7:
The effective area of the SXT: The thick curve shows gives the
effective area for the indicated filter. The thin curve is the open filter case (no
analysis filter) effective area over-plotted for comparison.
Figure 8:
The total SXT signal as a function of 
for the
open filter and the analysis filters as indicated. NOTE: Be and Al12
are mistakenly reversed in Tsuneta et al., (1991).
Figure 9:
Ratios of the SXT response functions. For the curve marked
``Be119/(2
Al12)'' the effective observing time with the Al12 filter has
been doubled with respect to the Be119 filter.
For the curve marked ``
Al12/Al.1'' the effective observing time with the
Al12 filter has again been doubled, this time with respect to the Al.1 filter.
The SXT X-ray filters were chosen to provide a different effective area for each filter as a function of wavelength (Fig. 7). The SXT response functions are computed by folding a thermal spectrum with the SXT effective area through each filter. The result is shown in Fig. 8, for the Mewe 1985 spectrum using coronal abundances. The ratios of the fluxes observed through the various filters is temperature sensitive. Three filter ratio combinations are shown in Fig. 9. These ratios are actually ``mean" temperatures and are only correct for the case of an isothermal plasma.
The SXT images may be used to compute temperatures after the data have been properly prepared. Normally, SXT_PREP should be called to prepare the data. The steps to follow are given in the next sections.