diff --git a/LuaLibs/CalcSlices.lua b/LuaLibs/CalcSlices.lua
index e013caf..e63b8e5 100644
--- a/LuaLibs/CalcSlices.lua
+++ b/LuaLibs/CalcSlices.lua
@@ -270,7 +270,7 @@ function CalcSlices.Exec( nPartId, nStmId, HMax)
 
    -- costanti
    local TOLER = 0.05 
-   local MID_TOLER = 0.5
+   local MID_TOLER = 0.1
    local BIG_TOLER = 2.0
    local MIN_LEN = 20.0
    local MIN_AREA = 25.0