                                                                                
Signal-to-noise ratios for stellar CCD images,                                  
based on:                                                                       
  A)     8.0 inch aperture scope                                                
  B)    18.0 mag per sq arcsec of sky                                           
  C)       3 arcsec detection circle                                            
  D)     100 sec longest single exp.                                            
  E)     1.5 arcsec-per-pixel scale                                             
  F)     100 elec/pixel readout noise                                           
  G)      70 thermal elec/pixel/sec                                             
  H) 2000000 star-signal constant                                               
  Q)         Quit                                                               
                                                                                
Choose a letter or type '/' to continue? /                                      
                                                                                
 Mag.  1 sec  10s  100s 1000s 10000s                                            
 10.0    20   143   577  1824  5769                                             
 11.0     8    69   332  1050  3320                                             
 12.0     3    30   176   556  1757                                             
 13.0     1    13    84   265   839                                             
 14.0     1     5    37   116   368                                             
 15.0     0     2    15    48   153                                             
 16.0     0     1     6    20    62                                             
 17.0     0     0     2     8    25                                             
 18.0     0     0     1     3    10                                             
 19.0     0     0     0     1     4                                             
 20.0     0     0     0     0     2                                             
                                                                                
Press <Enter> to continue?                                                      
                                                                                
Signal-to-noise ratios for stellar CCD images,                                  
based on:                                                                       
  A)     8.0 inch aperture scope                                                
  B)    18.0 mag per sq arcsec of sky                                           
  C)       3 arcsec detection circle                                            
  D)     100 sec longest single exp.                                            
  E)     1.5 arcsec-per-pixel scale                                             
  F)     100 elec/pixel readout noise                                           
  G)      70 thermal elec/pixel/sec                                             
  H) 2000000 star-signal constant                                               
  Q)         Quit                                                               
                                                                                
Choose a letter or type '/' to continue? Q                                      
