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probecals

-                      v19
+                      v20
 During evening/morning twilight (or thin clouds with moonlight), suitable data can be taken to generate new flats.
 In each filter (Clear, B, g, r, i) you need 10-20 "bright" images (counts ~40k max) and 10-20 "faint" images (counts ~10k max). Some day there might be an automated script to take this data.
+In each filter (Clear, B, g, r, i) you need at least 20 "bright" images (counts ~40k max) and at least 20 "faint" images (counts ~10k max). Some day there might be an automated script to take this data.
 Starting out, I'll assume it is twilight (or bright moonlight), the guider pipelines are running, and you've started images displaying. In the "GC1" and "GC2" tabs in the TCS GUI, make sure "Store" is checked, and that you are viewing the "Raw" extension of the images.
 Starting with one of the filters, adjust the exposure time until a bright (~40k) flat is obtained. Allow ~20 exposures to be taken. Adjust exposure time again until a faint (~10k) flat is obtained. Allow ~20 exposures to be taken. Repeat with all filters and on both GC1 and GC2.
+Starting with one of the filters, adjust the exposure time until a bright (~40k) flat is obtained. Allow at least 20 exposures to be taken. Adjust exposure time again until a faint (~10k) flat is obtained. Allow at least 20 exposures to be taken. Repeat with all filters and on both GC1 and GC2.
 ==== Creating flat fields from data ====