diff --git a/models/Files/irfs_eh.pdf b/models/Files/irfs_eh.pdf
index fdb9b32..624cb4d 100644
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diff --git a/models/Files/irfs_eh.png b/models/Files/irfs_eh.png
index 2052983..d02a701 100644
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diff --git a/models/Files/irfs_em.pdf b/models/Files/irfs_em.pdf
index 34f18e7..991fc0f 100644
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diff --git a/models/Files/irfs_em.png b/models/Files/irfs_em.png
index eb83fb9..0a8e9de 100644
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diff --git a/models/Functions/GenerateIRFPlot.m b/models/Functions/GenerateIRFPlot.m
index e30ac6b..e0882f2 100644
--- a/models/Functions/GenerateIRFPlot.m
+++ b/models/Functions/GenerateIRFPlot.m
@@ -66,7 +66,7 @@
             end
         end
         % add zero line
-        yline(0,'HandleVisibility','off')
+        yline(0,'HandleVisibility','off','linewidth',0.0001)
 
         % set ticks
         ytickformat('%.3f')