Other VPM-B implementations (V-Planner, MultiDeco, Fortran code) take the
default gradient of onset of impermeability as 8.2 atm.  We use bar as the
pressure unit, and 8.2 atm = 8.30865 bar.

This has negligible effect on all of the calculated plans I've tested, resulting
in a maximum decrease of 1 minute in total dive time for ~150 m deep dives, but
we should get unit conversions correct anyway.

Signed-off-by: Rick Walsh <rickmwa...@gmail.com>
---
 deco.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/deco.c b/deco.c
index 5d3b1d8..ec4501b 100644
--- a/deco.c
+++ b/deco.c
@@ -69,7 +69,7 @@ struct vpmb_config vpmb_config = {
        .crit_radius_N2 = 0.55,
        .crit_radius_He = 0.45,
        .crit_volume_lambda = 199.58,
-       .gradient_of_imperm = 8.2,
+       .gradient_of_imperm = 8.30865,          // = 8.2 atm
        .surface_tension_gamma = 0.18137175,    // = 0.0179 N/msw
        .skin_compression_gammaC = 2.6040525,   // = 0.257 N/msw
        .regeneration_time = 20160.0,
-- 
2.4.3

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