Things to note :
Conditions for drawing histogram
1. Fit graph paper
2. Only use the zig-zag lines if the intercepts are insignificant
3. The zig-zag lines are only used for x-axis not y-axis.
if used for y-axis, drawing of the bars or curve will be affected.
4. No repeating of the zig-zag lines in an axis.
PS I apologise if this is a disappointing post.