PS1 observatory filler data quality

Characterize the data quality of the observatory filler from the engineering run. As suggested by Moritani-san, we will start with visit=111167 from run17. The PS1 sources down to r=21.75 are included, but we do not know if the cut is too deep. We should first characterize the basic properties like S/N vs. r-mag. But, we also want to run the LAM 1d pipeline (with help from LAM) to measure the redshift success rate vs. r-mag, which will be the key plot to define the magnitude cut.