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-rw-r--r--profile.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/profile.c b/profile.c
index e56a1459d..290638d6a 100644
--- a/profile.c
+++ b/profile.c
@@ -1879,9 +1879,11 @@ static struct plot_info *create_plot_info(struct dive *dive, struct divecomputer
/* we have an O2 partial pressure in the sample - so this
* is likely a CC dive... use that instead of the value
* from the cylinder info */
+ double po2 = entry->po2 > amb_pressure ? amb_pressure : entry->po2;
double ratio = (double)fhe / (1000.0 - fo2);
- entry->phe = (amb_pressure - entry->po2) * ratio;
- entry->pn2 = amb_pressure - entry->po2 - entry->phe;
+ entry->phe = (amb_pressure - po2) * ratio;
+ entry->pn2 = amb_pressure - po2 - entry->phe;
+ entry->po2 = po2;
} else {
entry->po2 = fo2 / 1000.0 * amb_pressure;
entry->phe = fhe / 1000.0 * amb_pressure;