To optimize the scientific return of COS, we recommend that all observations be performed in TIME-TAG
mode, employ the default wavelength-calibration procedures (i.e., TAGFLASH=YES
), and obtain data at all four FP-POS
positions of each CENWAVE
setting (for the FUV gratings). Observers who wish to employ non-optimal observing techniques must strongly justify their observing strategy in the “Description of Observations” section of their Phase I proposal. A modest reduction in observational overheads will not normally be a sufficient justification for adopting non-optimal observing techniques. Whenever possible, observers should use the recommended techniques, even if this requires requesting additional resources in their Phase I proposal.