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-rw-r--r--src/optics.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/optics.h b/src/optics.h
index 70ff53b..4b41c6b 100644
--- a/src/optics.h
+++ b/src/optics.h
@@ -22,6 +22,8 @@
/* Global error string when optics_init() returns -1. */
extern char optics_err[256];
+extern double avg_index_h2o, avg_index_d2o;
+
/* Initialize the optics data by reading in the RSPR bank and precomputing the
* average absorption and scattering tables. */
int optics_init(dict *db);