PERIAPSIS SUMMARY PLOTS:  (Caption)
 

Orbit #	Day #	Several-hour window:  (gif-150K, ps-1570K)		20-minute window:  (gif-9K, ps-26K)
36	311	gif	ps	gif	ps
35	309	gif	ps	gif	ps
34	308	gif	ps	gif	ps
33	306	gif	ps	gif	ps
32	305	gif	ps	gif	ps
31	303	gif	ps	gif	ps
30	302	gif	ps	gif	ps
29	300	gif	ps	gif	ps
28	299	gif	ps	gif	ps
27	297	gif	ps	gif	ps
26	296	gif	ps	gif	ps
25	294	gif	ps	gif	ps
24	293	gif	ps	gif	ps
23	291	gif	ps	gif	ps
22	290	gif	ps	gif	ps
21	289	gif	ps	gif	ps
20	287	gif	ps	gif	ps
19	286	gif	ps	gif	ps

Click within the image below to get a close-up (45x55 degree) view.  
This plot shows the planetocentric east longitude and latitude of the MGS spacecraft while it is below 700 km altitude.  The square marks periapsis.  The plot background is a shaded relief map of Mars, which was obtained from the USGS Web Page.  The cylindrical equidistant projection is highly distorted near the poles.  A higher resolution postscript version of this image is here:  (543K, ps)