For cases when radvel automatically increases the number of walkers due to a large number of free parameters (i.e. lots of instruments/jitters), the --proceed functionality raises an error unless the correct number of walkers is explicitly specified with --nwalkers on the second plus call to mcmc.
For cases when radvel automatically increases the number of walkers due to a large number of free parameters (i.e. lots of instruments/jitters), the --proceed functionality raises an error unless the correct number of walkers is explicitly specified with --nwalkers on the second plus call to mcmc.