Material scan for ecal
The material scan behind the ECAL looks like it has way too much material in the ECAL barrel region, with 1e2 X0.
We should figure out why that is the case, and if other parts of the material scans are similarly affected.
While on the topic:
- add missing materials to the table of known materials (or figure out an automatic numbering scheme)
- add a legend
- use actual regions in compact xml and material scan instead of mathematical cylinders