R158B grating

R158B grating image. The dearth of light at the bottom of the image (blue spectral region) is due to the blue
cut-off of the tungsten lamp.

A line-cut through the image in the region of the ghost. The level of ghosting is extremely small.

A line-cut through the image in the region away from the ghost. The different bias levels of the two detectors which comprise
the mosaic is evident.