CaveateDue to problems/limitations in the Delphi development system, Gretep needs Windows to be running in (the normally default) Small Fonts Mode; other wise the window sizes and menus can go very strange. For more information on this, refer to the page on Strange Font Size Problems
GRETEP (Grenoble Thermal Ellipsoids Plot) is quite simple to use and is obtained from the LMGP program suite site at
Gretep also has a developing facility to show possible single/aromatic/double/triple bonds. This is still under development but may be of interest. If you can think of features that you would like to see in this regard, please consider passing them onto the author.
Load up a structure in Gretep.
Now select the Draw Double/triple check box. Gretep will now try and display which bonds might be aromatic or double bonds by changing their colour to green. In a hard copy, these will be printed as double bonds.