$expression(`isDefined(APPLICATION[parameters]='coordinates')` AND `isdefined(REFERRER[parameters]!='sapre_out.html')` AND `isdefined(REFERRER[parameters]!='grid_out.html')`) { Coordinate generators
Spacecraft trajectories
or
Planetographical coordinate grids
or
Switch to another planet
} { Coordinate generators }; $isDefined(APPLICATION[parameters]='radiation') { Radiation sources and effects
Radiation sources
Mars Energetic Radiation Environment Models (MEREM)
} { Radiation sources and effects }; $isDefined(APPLICATION[parameters]='miscellaneous') { Miscellaneous
Data base queries
} { Miscellaneous };