Pitch classes can be any non-negative number and are interpreted mod 12. If an illegal Forte number is entered, the program beeps and you need to edit the field. The program simply treats the curly braces as separators. This makes it easy to build up sets slowly. Following is a description of the keys used to navigate between and edit the input fields, and calculate similarity values.
Backspace deletes the previous character in the input field.
In the first column is the actual value for the function. In the second column is a percentile ranking for that value under that function. For example, the sets with Forte numbers 6Z12 and 4-22 have an IcVSIM value of 0.764 and a percentile ranking of 83.8. This helps given an idea of what a particular value means for a particular function.