mlu.txt: document on the postscript file mlu.ps

						2002-Apr-05(Fri)
						Takeshi K. Komatsubara (KEK)

 * This document is based on Bipul Bhuyan's Email to me on 2002-Apr-4.


 This postscript file illustrates the Level0 Refined Range mask currently used
 in the E949 data taking: 
	/e787/local/online/fastbus/trig/files/.tt.rr1 
 ( symbolic linked to v7_prompt.tt.rr1 ). 

 page 1 and 2: the masks for PNN1(upstream RR1_CUT(1) downstream RR1_CUT(2)) 
 page 3      : RR1_CUT(3), used in kp23 trigger.

 Each page contains 21 histograms, one for each SLAY (stopping layer).
 For each plot the x-axis is AVG_L0Z and the y-axis is the 'NTGT'.  


 To interpret the plots: accept events when it is black in the histograms.


 For history of Refined Range mask, see
	/e787/local/online/fastbus/trig/files/tt_history. 

 For more details on the making of the masks for PNN1, see
	 ~bhuyan/range/masks/masks2001.txt .



						2002-Apr-06(Sat)

 o plot_kp22_020406_pnn1mask.ps
      the masks for PNN1 on kp22 triggers (real data):
	  before(left) and after(right) imposing the masks. 

 o plot_kp22_020406_kp23mask.ps 
      the mask RR1_CUT(3) on kp22 triggers (real data): 
	  before(left) and after(right) imposing the mask. 

  These plots are consistents with the masks illustrated in mlu.ps; 
  the masks should be loaded correctly to the trigger system. 

 o plot_kp22_020406.ps
      Reduction of kp22 triggers (real data) by the masks.

		page 1: the masks for PNN1 
		     -- reduction x 1.72
		         reduction by restricting stlay to 11-18: x 1.41    
			 further reduction by the masks: x 1.12

		page 2: the mask RR1_CUT(3)
		     -- reduction x 5.99
			 reduction by restricting stlay to 12-18: x 1.90
			 further reduction by the mask: x 3.15


		     un-shaded distributions: 
		             plots from kp22 triggers
		     shaded distributions:    
                             plots after imposing the masks in offline.

		     Top left:	       online stopping layer (slay) in RS
		     Top right:	       dip angle (cis3d) in UTC
		     Bottom left:      Momentum (Ptot)
		     Bottom right:     Range (Rtot)

		     arrows indicate the pnn endpoints (227 MeV/c and 38.5cm)

--- End of this document.