sm is a proprietary product for which the astronomy department has a license. If it's not already in your search path, add /local/bin/ to get it. The advantage of sm is that you can quickly plot straightforward data yet at the same time you can make very complex scripts to exploit the full potential of the graphing package. The entire manual is available online. There are 3 ways sm is typically used: 1) interactively; 2) semi-interactively with user-defined macros; 3) semi- or non-interactively with user-built scripts. Method 1 is the fastest for simple data that you don't plan to look at again. Method 3 is preferred for complex graphing applications. Method 2 will be discussed only in passing.