Graphing calculator screen shots are not computer screen shots. There are currently no official guidelines for transcribing these screens. You may use contractions wherever they would be allowed by the Nemeth Code. I would advise indicating the screen with box lines. The spacing shown in the matrix in print is actually the correct spacing for a matrix, one cell between each column of numbers. Note that the minus sign is directly under the first digit of the number above, just as it would be done with a regular matrix. Transcribe the information in the screen following the Nemeth Code. Exceptions would be that no blank lines appear above and below the matrix in the print screen, and the ending bracket that follows the enlarge bracket appears on the bottom line of the matrix rather than the top line. The bold face indicator for letters and numbers could be used before the highlighted letters even though it would interfere with the alignment of the colons. The highlighted words would then have to be enclosed in boldface indicators, but I assume there would still be room to list those words horizontally across the top of the screen. Your only other option would be to create a symbol that you assign to mean the text is highlighted. I have no suggestions for that.