[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 random steps for the parameters (in the same order as the
parameter names). If no bound is specified, the Lower and Upper bounds
are +/- 10 times the step away from the starting value.