Space Telescope Science Institute
WFC3 Data Handbook 2.1 May 2011
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WFC3 Data Handbook > Chapter 3: WFC3 Data Calibration > 3.5 Calibration of WFC3 Spectroscopic Data

WFC3 images obtained using any of the three grism elements require special handling during pipeline calibration. calwf3 processing of grism images does not include extraction or calibration of the spectra. This must be done off-line using special tools.
The aXe software and documentation can be downloaded from:
The aXe cookbook is also available for download from:
The aXe software package was developed by the Space Telescope European Coordinating Facility (ST-ECF) for use with ACS slitless modes, and can be used for the reduction of WFC3 spectroscopic data. This package enables automatic and reliable extraction of large numbers of spectra from individual images. WFC3 grism data calibration and analysis, including an overview of aXe processing, is discussed in Section 7.4.
A slitless Spectroscopy Workshop was held at STScI in November, 2010, with a focus on using the aXe software. The Web cast for this event can be found at:

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