 [3];
                 SpiceDouble             dist;

                 /.
                 The variable `etemit' is the time at which the photons were
                 emitted from Mars, and `etrec' is the time at
                 which the picture was taken by MGS.
                 ./
                 SpiceDouble             etemit;
                 SpiceDouble             etrec;

                 /. 
                 The variables `lat' and `lon' and the latitude and longitude
                 associated 