diff --git a/module4/challenger_matlab.pdf b/module4/challenger_matlab.pdf index 5207a2f55327ac618506f8587ddffecf7ca347dd..bb727b095fac6d90da802c7aa6c881c1616f0e22 100644 Binary files a/module4/challenger_matlab.pdf and b/module4/challenger_matlab.pdf differ