316R (I) 

on-telescope measurements by IJL & KGB, 1999
   4400      0.54       
   4600      0.59   
   4800      0.67    
   5000      0.70    
   5200      0.71    
   5400      0.71    
   5600      0.69    
   5800      0.72    
   6000      0.73    
   6200      0.72    
   6400      0.67   
   6600      0.69    
   6800      0.66    
   7000      0.63
   7200      0.60
   7400      0.60
   7600      0.59
   7800      0.55
   8000      0.54