Report of the Mars 2020 Science Definition Team - Mustard,JF; Adler,M; Allwood,A; Bass,DS; Beaty,DW; Bell,JF; Brinckerhoff,WB; Carr,M; Des,Marais DJ; Drake,B; Edgett,KS; Eigenbrode,J; et al. (Mars Exploration Analysis Group (MEPAG), 2013)