 pt    d   dt    l dr   gap
("1/8" 8 10.228 10 9.066 1)
("1/4" 10 14.157 12 12.445 1.5)
("3/8" 14 17.662 14 15.95 2)
("1/2" 16 20.995 16 18.631 3) 
("3/4" 20 26.441 16 24.117 4) 
("1" 25 33.249 20 30.291 4)

("6" 4 10) 
("8" 6 10) 
("10" 8 11) 
("12" 10 12) 
("14" 12 12) 
("16" 14 14) 
("18" 16 18) 
("20" 18 18) 
("22" 20 18) 
("25" 22 19) 
("28" 25 19) 
("32" 28 19) 
("34" 30 19)

("6" 4 9) 
("8" 6 10) 
("10" 8 12) 
("12" 10 12)
("14" 12 14) 
("16" 14 14) 
("20" 16 16)
("25" 20 19)
("30" 25 19)
