| For the Muon Trigger upgrade project, the space between the Central Magnet and MuTr station 1 will be filled with additional absorber material. |   | 
| To switch this volume on in Pisa, add parameter 'ABSO'
to the list of passive volumes GEOP in file pisa.kumac. Volume parameters are in section $muon_abs_par in phenix.par |   | 
| Files involved: 
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