id	keyword
fet-4500	research
fet-4500	ejecta
fet-4500	crater
fet-4500	note
fet-4500	mars
fet-4500	science
fet-4500	vol
fet-4500	elevation
fet-4500	students
fet-4500	education
fet-4500	figure
fet-4500	university
fet-4500	technology
fet-4500	water