/usr/include/interpolation/grprs.h is in libemos-dev 000382+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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C Common blocks holding default or user supplied values for printing.
C
LOGICAL GRPRSET
INTEGER GRPRSM
C
COMMON /GRPRSCM/ GRPRSM, GRPRSET
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