Variable name considerations

For files being imported, variable names:

Can be no longer than 64 characters
Should appear on the first row of the variable data file (otherwise default names COL1, COL2 and so on are assigned)
Avoid using special characters in variable names (i.e. @, #, &, !, ^, /, etc.).

Variable names cannot use reserved key words. I1, NET, SUB, TN, CALC are all examples of Reserved Key Words.

Do not use the letter I followed by a number only, for anything other than logic (for example, I1 or I10 should not be used as variable names).