The font size must be between 1 and 128 points. Numbers bigger than 128, negative values, and decimal values are not valid. ...

The font size must be between 1 and 128 points. Numbers bigger than 128, negative values, and decimal values are not valid. The Font dialog box and the Font tab list the sizes available for printing. If you type a size that differs from those in the box, Microsoft Graph attempts to produce that size as closely as possible. Depending on your screen display and your printer driver, the results appear ragged. Check the font size you specified, and try the operation again.