Why is IDL adding it's own tick marks to my custom plot tick marks?
I'm trying to specify custom Y axis tick marks, but IDL is not cooperating. 

http://i.imgur.com/BFqMO.png

In the top left, 1.0000 should be the max value, but IDL puts a 57 there. 57 is the max array dimension of my data. 

I have an array of eta levels(strings) corresponding 1:1 with the array indices, and I want to use them as tick marks. I've got a bit of code that let's it plot X major tick marks, but IDL keeps throwing that silly max array index value in there instead of my desired final tick mark.

Is there a way I can get rid of that?
Why is IDL adding it's own tick marks to my custom plot tick marks?
===

I'm trying to specify custom Y axis tick marks, but IDL is not cooperating. 

http://i.imgur.com/BFqMO.png

In the top left, 1.0000 should be the max value, but IDL puts a 57 there. 57 is the max array dimension of my data. 

I have an array of eta levels(strings) corresponding 1:1 with the array indices, and I want to use them as tick marks. I've got a bit of code that let's it plot X major tick marks, but IDL keeps throwing that silly max array index value in there instead of my desired final tick mark.

Is there a way I can get rid of that?