512,512 alpha csv wkt,key1,key2 "POINT(3.3 0)",foo,1 "POINT(6.7 0)",bar,2 beta csv wkt,name1,ref1,name2,ref2 "LINESTRING(0 -0.6, 10 -0.6)",One,1,Two,2 "LINESTRING(0 -1.2, 10 -1.2)",One,1,Two,2 "LINESTRING(0 -1.8, 10 -1.8)",One,1,Two,2 "LINESTRING(0 -2.4, 10 -2.4)",One,1,Two,2 gamma csv wkt,name1,ref1,name2,ref2 "LINESTRING(0 0.6, 10 0.6)",One,1,Two,2 "LINESTRING(0 1.2, 10 1.2)",One,1,Two,2 "LINESTRING(0 1.8, 10 1.8)",One,1,Two,2 "LINESTRING(0 2.4, 10 2.4)",One,1,Two,2 frame csv wkt,nr "POINT(0 5)",1 "POINT(0 -5)",2 "POINT(10 5)",3 "POINT(10 -5)",4