imalign ("Mrk421-B*.fits",
"Mrk421-B_0.fits", "Mrk421-B_0.coo", "Mrk421-B*.fits", shifts="", boxsize=7,
bigbox=11, negative=no, background=INDEF, lower=INDEF, upper=INDEF,
niterate=3, tolerance=0, maxshift=INDEF, shiftimages=yes,
interp_type="linear", boundary_typ="nearest", constant=0., trimimages=yes,
verbose=yes, list="")

imcombine ("Mrk421-B*.fits",
"Mrk421-B.fits", headers="", bpmasks="", rejmasks="", nrejmasks="",
expmasks="", sigmas="", logfile="STDOUT", combine="average", reject="none",
project=no, outtype="real", outlimits="", offsets="none", masktype="none",
maskvalue=0., blank=0., scale="none", zero="none", weight="none", statsec="",
expname="", lthreshold=INDEF, hthreshold=INDEF, nlow=1, nhigh=1, nkeep=1,
mclip=yes, lsigma=3., hsigma=3., rdnoise="0.", gain="1.", snoise="0.",
sigscale=0.1, pclip=-0.5, grow=0.)