! pipedum_19k.scl ! 21/20, 3136/3125, 6144/6125, Gene Ward Smith, 2002 19 ! 128/125 35/32 28/25 8/7 49/40 5/4 32/25 175/128 7/5 10/7 256/175 25/16 8/5 80/49 7/4 25/14 64/35 125/64 2/1