From 3d579633671aff5e5e40ae9a28df8fdb4c617590 Mon Sep 17 00:00:00 2001
From: jmilou <julien.milli@wanadoo.fr>
Date: Fri, 8 Apr 2022 20:14:59 +0200
Subject: [PATCH] bug fix

---
 vigan/ao/vk.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/vigan/ao/vk.py b/vigan/ao/vk.py
index f17b849..67a7ffb 100644
--- a/vigan/ao/vk.py
+++ b/vigan/ao/vk.py
@@ -985,7 +985,7 @@ def residual_screen_sphere(seeing, L0, z, Cn2, v, arg_v, magnitude, zenith, azim
         # Computation of Ns
         Ns          = 1.5 * Nt
         var_pho_wfs = np.pi**2/(2*np.log(2))*1/Nphoton*(Nt/Nd)**2
-        var_ron_wfs = p.pi**2/3*(ron/Nphoton)**2*(Ns**2/Nd)**2
+        var_ron_wfs = np.pi**2/3*(ron/Nphoton)**2*(Ns**2/Nd)**2
         gain1       = gain
 
     if emccd: