Temperature differences on the PSL table are of interest because of the potential for producing beam jitter through thermally driven air currents (https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=31190, https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=31263)

During PEM injections, Anamaria and I measured temperatures on the PSL table at LLO to compare to LHO temperatures, measured previously. The table below compares hot spots that were several degrees warmer than the PSL table, at least at one site, and close to the beam path.  The PMC, for example, is not included because the outer surface of the tank was not several degrees warmer than the PSL table at either site.