Plotted entries from OPSLOG files in ISAAC report OPTDIST_SLZ, plot 5 (data set p_E_A):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS      	values
====================================================
2013-10-21	56587.631612480000000	8.59770067956886e-06