"character" contain the type of the association scheme used to obtain the Space Filling design, the association scheme used are :"Div" : Group divisible association scheme.
"Rect" :Rectangular association scheme.
"Nestdiv" : Nested group divisible association scheme.
"RightAng" : Right angular association scheme.
"GrectRightAng4" : Generalized rectangular right angular association scheme(4).
"GrectRightAng5" : Generalized rectangular right angular association scheme(5).
"GrectRightAng7" : Generalized rectangular right angular association scheme(7).