diff --git a/schainpy/model/graphics/figure.py b/schainpy/model/graphics/figure.py
index 508aa2a..3b0d1c3 100644
--- a/schainpy/model/graphics/figure.py
+++ b/schainpy/model/graphics/figure.py
@@ -312,7 +312,7 @@ class Axes:
     decimationy = None
     
     __MAXNUMX = 200
-    __MAXNUMY = 100
+    __MAXNUMY = 400
     
     __MAXNUMTIME = 500
     
@@ -501,15 +501,13 @@ class Axes:
         xlen = len(x)
         ylen = len(y)
         
-        decimationx = int(xlen/self.__MAXNUMX)+1 \
-                      if int(xlen/self.__MAXNUMX)>1 else 1 
-        decimationy = int(ylen/self.__MAXNUMY) \
-                      if int(ylen/self.__MAXNUMY)>1 else 1        
+        decimationx = numpy.floor(xlen/self.__MAXNUMX) - 1 if numpy.floor(xlen/self.__MAXNUMX)>1 else 1 
+        decimationy = numpy.floor(ylen/self.__MAXNUMY) + 1
+                
         
         x_buffer = x#[::decimationx]
         y_buffer = y#[::decimationy]    
         z_buffer = z#[::decimationx, ::decimationy]
-        
         #===================================================
         
         if self.__firsttime:
@@ -565,9 +563,9 @@ class Axes:
             maxNumX = self.__MAXNUMTIME
         
         if maxNumY == None:
-            maxNumY = self.__MAXNUMY
+            maxNumY = self.__MAXNUMY            
         
-        if self.__firsttime:
+        if self.__firsttime:            
             self.z_buffer = z
             self.x_buffer = numpy.hstack((self.x_buffer, x))
             
@@ -606,10 +604,8 @@ class Axes:
         xlen = len(self.x_buffer)
         ylen = len(y)
         
-        decimationx = int(xlen/self.__MAXNUMX) \
-                      if int(xlen/self.__MAXNUMX)>1 else 1 
-        decimationy = int(ylen/self.__MAXNUMY) \
-                      if int(ylen/self.__MAXNUMY)>1 else 1 
+        decimationx = numpy.floor(xlen/maxNumX) + 1
+        decimationy = numpy.floor(ylen/maxNumY) + 1
         
         x_buffer = self.x_buffer#[::decimationx]
         y_buffer = y#[::decimationy]