+/** @brief Forward Multiplicity Detector based on Silicon wafers.
+
+ This class contains the base procedures for the Forward
+ Multiplicity detector Detector consists of 3 sub-detectors FMD1,
+ FMD2, and FMD3, each of which has 1 or 2 rings of silicon sensors.
+
+ This contains the coarse version of the FMD - that is, the
+ simulation produces no hits in the FMD volumes, and the sensors
+ are not divided into strips and sectors. Useful for material
+ budget calculations
+ @ingroup FMD_sim
+ */