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23.2 STIS-Specific Reduction and Analysis Tasks

In Chapter 21 we discussed the components of the STIS pipeline that can be run as individual tasks. Observers may find that they wish to perform parts of the pipeline reduction again on their data using these tasks. Typical examples will be to re-perform cosmic ray rejection, altering the input parameters or using data from separate datasets, or to perform one-dimensional spectral extraction on long-slit data or to modify the input parameters (e.g., aperture extraction box, or background region) when doing one-dimensional spectral extraction for echelle data. For completeness we list the tasks again below. To run these tasks you need to retrieve the calibration reference files they require from the Archive and set the oref parameter appropriately (see "Mechanics of Full Recalibration" on page 21-30). An example of using x1d with a user specified extraction box (11 pixels high) and a user specified center (line=500) is given below:

cl> x1d stis_flt.fits stis.fits center=500 size=11

Table 23.2 lists some of the stand-alone tasks for working with STIS data. Consult the on-line help for more information about all these tasks. We expect additional options to become available within the distributed versions of these tasks as we add additional control parameters, and new functionality. Planned features for x1d include background subtraction for echelle modes and an optimal-weighted extraction for echelle and first-order spectra.

**STIS-Specific Tasks**
Task	Description
basic2d	Perform basic 2-D calibration.
inttag	Integrate TIMETAG event list to form an image.
ocrreject	Combine images, rejecting cosmic rays.
wavecal	Process wavecal images, determine spectral and spatial shifts.
x1d	Extract 1-D spectrum.
x2d	Rectify spectral images.

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23.2 STIS-Specific Reduction and Analysis Tasks

Task

Description