EMCEE Caution

    - Contrary to MFIT or ADJUST, EMCEE does ***NOT*** return best fit  val-
    ues. This can be done a posteriori using the ESHOW command.

    -  EMCEE  cannot be interrupted by ^C.  While EMCEE will react to ^C, it
    will not stop properly. You may no longer be  able  to  continue  after-
    wards,  and  you  may have to kill the whole process. This is because it
    uses an intrincate nesting of SIC and Python commands and macros.