Fixed typo

Plots/Steps/step_1.m

@@ -14,5 +14,5 @@ for i = 1:3
     t = linspace(0, tmax, n);
     steps(:,i) = step(P,t);
 end
-saveMatrix2File('step_1.csv', [t', steps], 3, {'t', 's1', 's2', 's3'})?ymax
+saveMatrix2File('step_1.csv', [t', steps], 3, {'t', 's1', 's2', 's3'})