Click here to see the SAS code. Click here to see the example. See my blog for more information about this graph! Here's how I got the data ... ----- http://www.ngdc.noaa.gov/mgg/gdas/gd_designagrid.html Your Grid Id: bobsas1 Grid Database: ETOPO2 - 2-minute global relief x - Windows Lat/Lon (left defaults - lat(up/down) = 19N-23N , lon (across)=86(30min)W-92W Cell size - 2-minute Cell params - changed to 4-byet floating pt, tenths of meters Format: XYZ (lon,dat,depth), No Header, Space delimited, omit empty grid cells Clicked 'Design-A-Grid' button. Clicked 'Next-->' button Clicked 'Compress and Retrieve' button Clicked 'Retrieve' button Clicked 'save' Saved bobsas1.zip to my U: Then, after saving it, I unzipped it, which created a directory structure... There's a lot of 'junk', but the file I wanted was ... /u/realliso/bobsas1_data/bobsas1/bobsas1.xyz (I renamed that to crater.xyz in the current directory) -----