[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 bounds for some or all parameters. If not speci- fied, the bounds are derived from +/- 10 times the parameter step.