diff --git a/slides/sections/4.md b/slides/sections/4.md
index e36a998..e651514 100644
--- a/slides/sections/4.md
+++ b/slides/sections/4.md
@@ -86,16 +86,16 @@ How to estimate sample median, mode and FWHM?
   \draw [line width=3, ->, cyclamen] (-5,0) -- (5,0);
   \node [right] at (5,0) {$x$};
   % points
-  \draw [blue!50!black, fill=blue] (-4.6,-0.1) rectangle (-4.8,0.1);
-  \draw [blue!50!black, fill=blue] (-4,-0.1)   rectangle (-4.2,0.1);
-  \draw [blue!50!black, fill=blue] (-3.3,-0.1) rectangle (-3.5,0.1);
-  \draw [blue!50!black, fill=blue] (-2.3,-0.1) rectangle (-2.5,0.1);
-  \draw [blue!50!black, fill=blue] (-0.6,-0.1) rectangle (-0.8,0.1);
-  \draw [blue!50!black, fill=blue] (-0.1,-0.1) rectangle (0.1,0.1);
-  \draw [blue!50!black, fill=blue] (1.1,-0.1)  rectangle (1.3,0.1);
-  \draw [blue!50!black, fill=blue] (2,-0.1)  rectangle (2.2,0.1);
-  \draw [blue!50!black, fill=blue] (2.7,-0.1)  rectangle (2.9,0.1);
-  \draw [blue!50!black, fill=blue] (4,-0.1)    rectangle (4.2,0.1);
+  \draw [yellow!50!black, fill=yellow] (-4.6,-0.1) rectangle (-4.8,0.1);
+  \draw [yellow!50!black, fill=yellow] (-4,-0.1)   rectangle (-4.2,0.1);
+  \draw [yellow!50!black, fill=yellow] (-3.3,-0.1) rectangle (-3.5,0.1);
+  \draw [yellow!50!black, fill=yellow] (-2.3,-0.1) rectangle (-2.5,0.1);
+  \draw [yellow!50!black, fill=yellow] (-0.6,-0.1) rectangle (-0.8,0.1);
+  \draw [yellow!50!black, fill=yellow] (-0.1,-0.1) rectangle (0.1,0.1);
+  \draw [yellow!50!black, fill=yellow] (1.1,-0.1)  rectangle (1.3,0.1);
+  \draw [yellow!50!black, fill=yellow] (2,-0.1)  rectangle (2.2,0.1);
+  \draw [yellow!50!black, fill=yellow] (2.7,-0.1)  rectangle (2.9,0.1);
+  \draw [yellow!50!black, fill=yellow] (4,-0.1)    rectangle (4.2,0.1);
   % future nodes
   \node at (-1,-0.3)  (1a) {};
   \node at (3.1,0.3)  (1b) {};
@@ -172,10 +172,10 @@ $$
   \begin{center}
   \begin{tikzpicture}
     % points
-    \draw [blue!50!black, fill=blue] (-2,-0.1) rectangle (-1.8,0.1);
-    \draw [blue!50!black, fill=blue] (-0.1,-0.1) rectangle (0.1,0.1);
-    \draw [blue!50!black, fill=blue] (1.3,-0.1) rectangle (1.5,0.1);
-    \draw [blue!50!black, fill=blue] (0.7,-0.1) rectangle (0.9,0.1);
+    \draw [yellow!50!black, fill=yellow] (-2,-0.1) rectangle (-1.8,0.1);
+    \draw [yellow!50!black, fill=yellow] (-0.1,-0.1) rectangle (0.1,0.1);
+    \draw [yellow!50!black, fill=yellow] (1.3,-0.1) rectangle (1.5,0.1);
+    \draw [yellow!50!black, fill=yellow] (0.7,-0.1) rectangle (0.9,0.1);
     \pause
     % lines
     \draw [cyclamen, dashed] (-1.9,0.1) -- (-1.9,1);
@@ -194,7 +194,7 @@ $$
     \pause
     % sum
     \draw [fill=white, white, opacity=0.5] (-3.5,0.1) rectangle (3,1.3);
-    \draw[domain=-3.4:3.4, smooth, variable=\x, blue, very thick]
+    \draw[domain=-3.4:3.4, smooth, variable=\x, yellow, very thick]
           plot ({\x}, {exp(-(\x + 1.9)*(\x + 1.9)) +
                        exp(-\x*\x) +
                        exp(-(\x - 1.4)*(\x - 1.4)) +
diff --git a/slides/sections/5.md b/slides/sections/5.md
index cd8311a..cd20c8a 100644
--- a/slides/sections/5.md
+++ b/slides/sections/5.md
@@ -37,18 +37,18 @@ Quantify distance between expected and observed CDF. KS statistic:
     \draw [cyclamen, fill=cyclamen!20!white] ( 1.6,0) rectangle ( 2.3,4);
     \draw [cyclamen, fill=cyclamen!20!white] ( 2.3,0) rectangle ( 2.5,4.5);
     % points
-    \draw [blue!50!black, fill=blue] (-2.6,-0.1) rectangle (-2.4,0.1); %-2.5
-    \draw [blue!50!black, fill=blue] (-1.6,-0.1) rectangle (-1.4,0.1); %-1.5
-    \draw [blue!50!black, fill=blue] (-1,-0.1)   rectangle (-0.8,0.1); %-0.9
-    \draw [blue!50!black, fill=blue] (-0.7,-0.1) rectangle (-0.5,0.1); %-0.6
-    \draw [blue!50!black, fill=blue] (0.4,-0.1)  rectangle (0.6,0.1);  % 0.5
-    \draw [blue!50!black, fill=blue] (0.6,-0.1)  rectangle (0.8,0.1);  % 0.7
-    \draw [blue!50!black, fill=blue] (1.1,-0.1)  rectangle (1.3,0.1);  % 1.2
-    \draw [blue!50!black, fill=blue] (1.5,-0.1)  rectangle (1.7,0.1);  % 1.6
-    \draw [blue!50!black, fill=blue] (2.2,-0.1)  rectangle (2.4,0.1);  % 2.3
+    \draw [yellow!50!black, fill=yellow] (-2.6,-0.1) rectangle (-2.4,0.1); %-2.5
+    \draw [yellow!50!black, fill=yellow] (-1.6,-0.1) rectangle (-1.4,0.1); %-1.5
+    \draw [yellow!50!black, fill=yellow] (-1,-0.1)   rectangle (-0.8,0.1); %-0.9
+    \draw [yellow!50!black, fill=yellow] (-0.7,-0.1) rectangle (-0.5,0.1); %-0.6
+    \draw [yellow!50!black, fill=yellow] (0.4,-0.1)  rectangle (0.6,0.1);  % 0.5
+    \draw [yellow!50!black, fill=yellow] (0.6,-0.1)  rectangle (0.8,0.1);  % 0.7
+    \draw [yellow!50!black, fill=yellow] (1.1,-0.1)  rectangle (1.3,0.1);  % 1.2
+    \draw [yellow!50!black, fill=yellow] (1.5,-0.1)  rectangle (1.7,0.1);  % 1.6
+    \draw [yellow!50!black, fill=yellow] (2.2,-0.1)  rectangle (2.4,0.1);  % 2.3
     % expected
     \pause
-    \draw[domain=-2.5:2.5, yscale=5, smooth, variable=\x, blue, very thick]
+    \draw[domain=-2.5:2.5, yscale=5, smooth, variable=\x, yellow, very thick]
           plot ({\x}, {((atan(\x)*pi/180) + pi/2)/pi});
     \pause
     \draw [very thick, cyclamen, <->] (0.5,2.5) -- (0.5,3.25);