/usr/lib/iraf/lib/math/interp.h is in iraf-dev 2.16.1+2018.03.10-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | # File of definitions for interpolator package.
# Interpolator Types:
define IT_FUNCTIONS "|nearest|linear|poly3|poly5|spline3|"
define IT_NEAREST 1
define IT_LINEAR 2
define IT_POLY3 3
define IT_POLY5 4
define IT_SPLINE3 5
define ITNIT 5 # number of types
# Size of header etc. used for part of coeff dimension
define SZ_ASI 20
# Total number of points used in spline interpolation of of bad pixels by
# subroutine arbpix.
define SPLPTS 16
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