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-rw-r--r--include/ballistics.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/ballistics.h b/include/ballistics.h
index 470c7a6..84a883d 100644
--- a/include/ballistics.h
+++ b/include/ballistics.h
@@ -13,4 +13,9 @@ double calculate_air_density(double temperature,
double pressure,
double relative_humidity);
+double retard(DragModel ballistic_model,
+ double ballistic_coefficient,
+ double velocity,
+ double temperature);
+
#endif