--- ray/doc/ray.1	2023/11/16 21:57:39	1.42
+++ ray/doc/ray.1	2023/11/17 20:02:07	1.43
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: ray.1,v 1.42 2023/11/16 21:57:39 greg Exp $"
+.\" RCSid "$Id: ray.1,v 1.43 2023/11/17 20:02:07 greg Exp $"
 .\" Print using the -ms macro package
 .DA 11/13/2023
 .LP
@@ -1207,11 +1207,9 @@ mod spectrum id
 0
 5+ nmA nmB s1 s2 .. sN
 .DE
-The first two real arguments indicate the limits of the covered
+The first two real arguments indicate the extrema of the
 spectral range in nanometers.
-Subsequent real values correspond to multipliers in each wavelength band,
-where the first band goes from nmA to nmA+(nmB-nmA)/N, and N is the
-number of bands (i.e., the number of real arguments minus 2).
+Subsequent real values correspond to multipliers in at each wavelength.
 The nmA wavelength may be greater or less than nmB,
 but they may not be equal, and their ordering matches
 the order of the spectral values.