I have been trying to import the map as per the instructions, but my image is always slanted to the right.
any help would be much appreciated.
The diagonal slant indicates that your line is too short for some reason. According to ETOPO1 Global Relief | NCEI (noaa.gov), there are two different registrations for ETOPO1, node-centered and grid-centered. The node-centered version is one sample larger in width and height. The quickest way to see if that' the problem is to change the Line Width from 43202 to 43200. If that mostly fixes it, also change the Width to 21600 and the Height to 10800. Or download the other data set.
Thanx...thought for sure I grabbed the correct file the Annual referred to.