a gain of 0.02 or less of a light reflected in the direction at 20° or more from the specular reflection direction of the incident light, the gain being obtained by normalizing {TAIL ~ a reflected light intensity} using a specular reflection intensity of {HEAD ~ a standard diffuse plate} as 1 
a gain of 0.02 or less of a light reflected in the direction at 20 ° or more from the specular reflection direction of the incident light , the gain being obtained by normalizing { TAIL ~ a reflected light intensity } using a specular reflection intensity of { HEAD ~ a standard diffuse plate } as 1
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH