I haven't used this program--it might be wonderful, but I am puzzled by all of the otherwise high-quality plotting programs for the Mac that force you to put your data into ASCII files. This is a big nuisance for technical data which is usually available in binary form, thus requiring a wasteful and potentially error-prone step of conversion. Floating-point binary formats were standardized years ago. Making a program have an option to read binary files is trivial, even allowing the user to specify header bytes and row-column ordering. It just amazes me that this is not included in most plotting programs.