The mean seeing at the OMM is 1.2''. The spatial scale is 0.93'' pixel . In order to use the whole field of view, we contracted Andover Corporation to provide us with a custom made circular filter with a diameter of 140 mm. This filter's specifications were optimized for observations where temperatures may span -30 to 20 celsius. The field of view is 32' in diameter.
North is up and east is to the left.
The interferometer has a free spectral range of 392.4 km s at H and a spectral resolution of 11.3 km s .