For MUFFIN every calorimeter cell consists of several boxes which contain the uranium scintillator sandwiches. With this representation MUFFIN can calculate for a traversing particle the exact length of the trajectory within each cell.
Almost all cells in the HAC region consist of a single box, while the cells in the EMC region consist of three ( FCAL) or two ( BCAL, RCAL) boxes to take into account the HES gap. Only the HAC cells in BCAL towers and are constructed of two boxes to construct their volumes precisely.