KM_Q1             494 ext/gd/libgd/gd_interpolation.c 		return(KM_Q0-x*(KM_Q1-x*(KM_Q2-x*KM_Q3)));
KM_Q1             500 ext/gd/libgd/gd_interpolation.c 		return(KM_Q0+x*(KM_Q1+x*(KM_Q2+x*KM_Q3)));