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40.3 Displaying HSP Data

To get started using IRAF and STSDAS refer to the tutorial information in Appendix A of Volume I of this manual, or in the STSDAS Users Guide. An example of displaying HSP data is provided below.

40.3.1 Displaying the SHP and UDL

The header consists of engineering telemetry values, plus other information. The SHP and the UDL each contain two groups. This should be checked by looking at the keyword GCOUNT. The value for GCOUNT should be 2. The keyword PTSRCFLG (point source flag) should list either P for a point source or E for an extended source. The IRAF task listpixels under the images package can be used to look at the values of the SHP and UDL pixels. The following chart shows the correct value for SHP pixel #937 according to MODE and if the source is EXTENDED or POINT.


Correct Value for SHP Pixel Value 937

Mode

Source

SHP 937
Pixel Value

SCP

P

1

SSP

P

2

SCP

E

257

SSP

E

258

ARS

-

3

40.3.2 Displaying HSP Area Scans

HSP area scans can be displayed by using the IRAF surface or contour tasks under the plot package.

You can display area scans (which make little images) using the IRAF display task and SAOimage, described on page 3-4. The time series data can be displayed using either splot (page 3-25) or implot (page 3-10), which will make one-dimensional plots of counts versus time.

Figure 40.1: HSP Area Mode Display

Figure 40.2: HSP Time Series Data Plot



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