Table 2: Evolution of the mean pulse height of both PMs (in mV) and values of each change on the high voltages (in V). The added index 1 and 2 indicates the corresponding PM tube. The maximum voltage supported by each PM is 1200 V.
Date $X_{\rm m1}$ $X_{\rm m2}$ Voltage 1 Voltage 2
7-Mar.-96 228 231 889.5 967.5
17-Mar.-96 247 245 909.5 978.5
21-May-96 229.3 229.5    
15-Oct.-96 202.5 211.5    
13-Jan.-97 187.2 204.3    
15-Mar.-97 177.8 200.5    
14-May-97 170.2 197.4    
16-Oct.-97 159.1 190.8    
17-Oct.-97 247.8 236.1 959.5 1008.5
07-Dec.-98 221.5 219.9    
07-Dec.-99 214.1 211.6    
12-May-00 254.1 251.6 979.5 1028.5
16-May-01 220.1 232.9    
15-Apr.-05 191.9 201.6    
22-Apr.-05     1028.5 1053.5
18-May-05 241.5 250.1    


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