will calculate an optimum exposure in terms of both KVP and MAS, and ask if the operator wants to try any other settings of either KVP or MAS. Whenever a single character is solicited on the second screen pressing alt;ESCagt; will allow the operator to change ... S2: the speed of the intensifying screens. For Trimax T4 screens S2=l. For T16 S2=0-2667. This variable can be altered in line 3010 if necessary.