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added ppo foam to list of materials. This is an approximation for the material of the Dortmund Cold Box (DOBOX) used in ATLAS ITk Pixels testbeams (cherry picked from commit d8834c9b)
8c7decbd
added ppo foam to list of materials. This is an approximation for the material of the Dortmund Cold Box (DOBOX) used in ATLAS ITk Pixels testbeams (cherry picked from commit d8834c9b)