[ADJUST\]EMCEE Data Command [/BEGIN] [/BOUNDS Par Low Up [...]]
[/LENGTH Length] /PARAMETERS Va Vb Vc ... [/START A1 B1 C1 ...] [/STEP
A2 B2 C2 ...] [/WALKERS NWalk]
Specify the parameter names. These must be global SIC variables, so that
they can be used the the "Command" computing the Chi^2.