Purpose
Take one hg spectra on the blue side using the trapdoor as a shutter.
Code could be improved to specify exposure time. Exptime is hardcoded.
Usage
cal_trap_hg_blue [-nowait] [-dark] [nexp]
Arguments
-nowait = return before readout of last image in loop
nexp = number of exposure to take (default=1)
Output
Text feeback is sent to the terminal.
Exit values
0 = normal completion
1 = wrong number of arguments
2 = error during exposure
Example
1) Take a single LRIS blue exposure
cal_trap_hg_blue
2) Take 10 LRIS blue exposures
cal_trap_hg_blue 10
3) Take 10 LRIS blue exposures, and exit when the final one
begins to readout
cal_trap_hg_blue -nowait 10