6/13/96   updated based on actual gratings selected for TOGA.
                grating efficiencies include all vignetting, etc.

             Source - TMA - Grating - Detector : Count Rates
             -----------------------------------------------

   Source    Flux     TMA area   Grating effic    Detector       Count rate
             at TMA     cm^2      one-sided        efficiency      /sec
            /sec cm^2   PER
                      QUADRANT
 EIPS    
 ----    
    Mg K       300      6.5      >3% all grats    >30% all          > 17
    1.25 keV
                                ~0.5% MEG 3rd                      ~ 3.0
                                     order

    Ti K
    4.5 keV     30      4.4        6.8% HEG       80 % FPC,SSD       7.2   
                                                  20 % HSI           1.8


 Penning
 -------
    56 A         1      6.7       2x6 % LEG       20 % FPC,HSI       0.16   
                                    3 % MEG                          0.04   

   131 A         2      8.0       2x6 % LEG        50 % HSI          1.0  


 RAS w/HIREFS
 ------------
0.15-1.5 keV
continuum,       4      6.7       2x6 % LEG             30 %         1.0     
E/dE = 75,                          3 % MEG                          0.24
200/100 slits

C K narrowed     1      6.7       2x6 % LEG      30,50 % HSI,FPC   0.06   
to E/dE 1500                        3 % MEG                         to 0.40 
using 10/5 slits