If header variable LCALDA is TRUE, changing EVLA EVLO and EVDP will change GCARC and DIST. On Fri, 16 Sep 2011, Januka Attanayake wrote: > Good afternoon, > I have a question regarding SAC file headers. If I were to change the source > properties, ex. EVLA EVLO and EVDP, is there a way to recalculate GCARC and > DIST within SAC? > > Thanks ! > > Januka.