System-related parameters

PHOEBE keyword	Type	Short description
HJD0	adjustable	Zero epoch time in HJD
PERIOD	adjustable	Pperiod value in days
DPDT	adjustable	Period time derivative
PSHIFT	adjustable	Phase shift
SMA	adjustable	Semi-major axis in $R_\odot$
RM	adjustable	Mass ratio ($M_2/M_1$)
INCL	adjustable	System inclination in degrees
VGA	adjustable	Systemic radial velocity