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-rw-r--r--subsurface-core/dive.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/subsurface-core/dive.h b/subsurface-core/dive.h
index 08100a270..0f5c43451 100644
--- a/subsurface-core/dive.h
+++ b/subsurface-core/dive.h
@@ -129,6 +129,7 @@ extern int units_to_sac(double volume);
/* Volume in mliter of a cylinder at pressure 'p' */
extern int gas_volume(cylinder_t *cyl, pressure_t p);
+extern double gas_compressibility_factor(struct gasmix *gas, double bar);
static inline int get_o2(const struct gasmix *mix)