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This procedure acquires a 2D image, using parameters defined by FP_SETUP.
The etalon is first stepped to the previously specified position. The observer is asked to specify the exposure time. The observer is then asked whether the shutter should be opened, then asked to check that the intensity level is OK, and then asked if the exposure should be started.
At the end of an exposure, type IPC to close the shutter and KEEP IPCS to keep the data.