XMM-Newton SAS Home Page
XMM-Newton Science Analysis System

oal (oal-3.139) [xmmsas_20211130_0941-20.0.0]


Setting this variable to a comma separated list of two numbers $slope,frac$ with $0<=frac<=1$ overrides any values given to SAS_OBT_MET_FIT. It enforces a linear relationship between OBT and MET with a slope of $slope$. For this only one data point from the Time Correlation File is needed. The point taken is $N\times frac$ with $N$ being the total number of points available, e.g. $frac=0$ selects the first, $frac=1$ the last point.

Caution: Please alter the above parameters via SAS_OBT_MET_LINEAR only when you exactly know what you are doing. Out-of-range conditions are caught but improper values can lead to inaccurate event arrival times.

XMM-Newton SOC -- 2021-11-30