EMCEE /LENGTH

        [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 length of the MCMC chain. The  total  number  of  executions
    will  be  the  Length times the number of parameters times the number of
    walkers per parameter.  Length is the only  control  allowed  to  change
    when restarting a MCMC chain.