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13.FOURC> mvr th 114.FOURC>will move θ by one degree.The tw motor delta (tweak) macro is useful when lining up the diffractometer orwhen searching for the beam.14.FOURC> tw th .1Indicate direction with + (or p) or - (or n) or enternew step size. Type something else (or ˆC) to quit.th = 26.2515, which way (+)? th = 26.3515, which way (+)? th = 26.4515, which way (+)? th = 26.5515, which way (+)? th = 26.6515, which way (+)? -th = 26.5515, which way (-)? th = 26.4515, which way (-)? ˆC15.FOURC>Each time you hit ,the motor moves delta in the plus or minus direction.CountingYoucount photons using the ct macro. Without arguments, this macro counts for thetime set by the variable COUNT ,which is typically one second. According to the conventionused in the standard macros, positive count times indicate counting to secondsand negative count times indicate counting to monitor counts.15.FOURC> ct 10Mon Feb 15 01:45:12 1994Seconds = 10Monitor = 389387 (38939/s)Detector = 192041 (19204/s)16.FOURC> ct -40000Mon Feb 15 01:45:28 1994Seconds = 1.027Monitor = 40000 (38948/s)Detector = 19756 (19237/s)17.FOURC>INTERIM WORK-IN-PROGRESS (8/16/01) NOT FOR GENERAL DISTRIBUTION USER MANUAL AND TUTORIALS 11