20/10: Plano
20/15: Plano
20/20: Plano to -0.125
20/25: -0.25 to -0.375
20/30: -0.5 to -0.75
20/40: -0.875 to -1
20/50: -1.125 to -1.25
20/60: -1.375
20/70: -1.5
20/80: -1.625 to -1.75