Add Eterms of Aberration
CALL sla_ADDET (RM, DM, EQ, RC, DC)
RM,DM  D  $\left[\phantom{\rule{0.3em}{0ex}}\alpha ,\delta \phantom{\rule{0.3em}{0ex}}\right]$ without Eterms (radians) 


EQ  D  Besselian epoch of mean equator and equinox 
RC,DC  D  $\left[\phantom{\rule{0.3em}{0ex}}\alpha ,\delta \phantom{\rule{0.3em}{0ex}}\right]$ with Eterms included (radians) 