Concatenating two skymodels with different formats (name - patch -type vs name - type - patch) will return a mixed-format file (which will cause issues when reading). In particular, the skymodel itself seems to be fine but the "default" line differs in format from the rest of the file.
I concatenated the files by loading both in with lsmtool.load() and then concatenate with .concatenate().
Attached are the skymodel files (3C196.skymodel.txt and Ateam.skymodel.txt are concatenated into output.skymodel.txt).
Thanks in advance!
Christian Groeneveld
output.skymodel.txt
Ateam.skymodel.txt
3C196.skymodel.txt