keyword=Prescale settings for run 4390+

These prescales are set to deliver the following DAQ trigger rates at 50 uA:

T1/T3/T6: 10 Hz, T2/T4: 5 Hz, T5: ~500 Hz, T7: All, T8: 2 Hz

ps1=20000,ps2=450,ps3=5000,ps4=300,ps5=2,ps6=800,ps7=1,ps8=500

Runs 4388,4389 are also production runs, but the T1,T3 prescales were set much lower.