The short slit, cross-dispersed IJ, JH, and HK
grisms provide two pixel resolving powers of
1100 through a 1 
15'' slit with complete
wavelength coverage from 0.98 
m to 2.49 m. Wider short
slits in the Aperture Wheel can be used at the expense of spectral
resolution.
The observing procedure for the short slit grisms is similar to the
long slit grisms. More care is required in the placement of the two
object positions along the short slit to avoid light loss at the slit
ends while accurately measuring the sky flux at the other slit
position. In practice, this means measuring spectra at two position
displaced along the slit by 
from its center.
The expected spectral images for common astronomical lines, airglow, Xenon and Argon arcs, with each grism are shown in Figures 12 to 17. Plots of extracted Xenon and Argon arc spectra for each order of each cross-dispersed grism are shown in Appendix J.
Figure 12: Predicted astronomical (top) and airglow (bottom) spectra
for the IJ grism.
Figure 13: Predicted Xenon (top) and Argon (bottom) lamp spectra for
the IJ grism.
Figure 14: Predicted astronomical (top) and airglow (bottom) spectra
for the JH grism.
Figure 15: Predicted Xenon (top) and Argon (bottom) lamp spectra for
the JH grism.
Figure 16: Predicted astronomical (top) and airglow (bottom) spectra
for the HK grism.
Figure 17: Predicted Xenon (top) and Argon (bottom) lamp spectra for
the HK grism.