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computer programs
There are two widely used programs for plotting molecular structures for publication purposes: PLUTO [Motherwell (1970). University Chem. Lab., Cambridge, England] and ORTEP [Johnson (1965). Report ORNL-3794. Oak Ridge National Laboratory, Tennessee]. A program PLORTEP has been written which joins the best features of these two programs. PLUTO has an English-like set of instructions which are easy to learn and use, while ORTEP produces very high quality pictures.