After running the chains, first make an image of the full observation. This is best done using the following script:

#!/bin/bash
xmmscripts=${XMMTOOLS}
xmmprepare=${xmmscripts}/xmmprepare
xmmextract=${xmmscripts}/xmmextract
odf=0112780401

${xmmextract} --logfile="pn_full_sd.log" --prepdir=${odf} \
    --full --pn --singles --doubles

${xmmextract} --logfile="m1_full_sd.log" --prepdir=${odf} \
    --full --mos1 --singles --doubles

${xmmextract} --logfile="m2_full_sd.log" --prepdir=${odf} \
    --full --mos2 --singles --doubles

This produces an image

0112780401/pn/full/image/0112780401/full_sd.img

and similar for the MOS1 and MOS2 cameras. Use ds9 to see whether the image looks o.k.:

ds9 0112780401/pn/full/image/0112780401/full_sd.img

It is best to use a logarithmic color scale.