set lat|lon|lev|time|ens val1 <val2>
This set command sets one dimension of the dimension environment using world coordinates.
set x|y|z|t|e val1 <val2>
This sets one dimension of the dimension environment using grid
coordinates. You may use whatever coordinates are convenient to you.
set lon is equivalent to issuing
both set the
x dimension. The difference is only the units
you wish to use when entering the command.
When you enter just one value, that dimension is said to be "fixed". When you enter two values, that dimension is said to be "varying". The combination of fixed and varying dimensions defines the dimension environment.