QUESTION:
How high is Mars Global Surveyor's mapping orbit?

ANSWER from Charles Whetsel on November 30, 1997:
When MGS reaches it's final mapping orbit, it will circle Mars at an
altitude of about 380 km, from which it will be able to continuously fire
it's laser to measure it's altitude above the surface below (including any
mountains or craters).  The first data results from the Mars Orbital Laser
Altimeter can be seen on the web at the following URL:
http://mars.jpl.nasa.gov/mgs/sci/mola/data1/mola_first.html