plot \
         "render.csv" using 1:2 title '1' with lines,\
         "render.csv" using 3:4 title '2' with lines,\
         "render.csv" using 5:6 title '3' with lines,\
         "render.csv" using 7:8 title '4' with lines,\
         "render.csv" using 9:10 title '5' with lines,\
         "render.csv" using 11:12 title '6' with lines,\
         ;