Since all of the imaging capabilities are supported, it contains information relevant to spectroscopic operations only. The STIS aperture wheel has 65 positions, several of which correspond to multiple slits or masks. Only a small fraction of the available spectroscopic apertures are currently supported. Table A.1 provides a complete list of STIS apertures available for spectroscopy, together with comments regarding their characteristics or purposes. STIS Spectroscopic Apertures.
Supported apertures are in boldface.
All of these except the first are supported. Fiducial bars on the long slits which can be used for chronographic spectroscopy. Only the 52X0.2F1 is supported. A long slit with 3 fiducial bars where width in arcsec is given by the third dimension. See Figure A1.1 .