Some control of the axes in an IDL plot can be done through the
|1||Force exact axis range (from data)|
|2||Extend axis range|
|4||Suppress entire axis. This will eliminate plotting the axes at all. Useful if you want to use the
|8||Draw axis only on one side.|
|16||Inhibit setting the Y axis minimum value to 0 (only works on y axis)|
These keywords are bitwise so they can be added together to get a combination of effects.
NOTE: if you want to just suppress the text and tick marks in one of the axes:
plot, x, y, yticks = 1, ytickname = [' ', ' ']
This will set the plot to have only one major tick interval at the top and bottom of the axis and name them with a string with an empty space.