REF_DISTANCE = 10.0
ROLLOFF_FACTOR = 0.75
a = 0.1
d = 20.0

while (a <= 1.0):
  r0 = (REF_DISTANCE    ) / ((REF_DISTANCE    ) + ROLLOFF_FACTOR * ((d    ) - (REF_DISTANCE    )))
  r1 = (REF_DISTANCE * a) / ((REF_DISTANCE * a) + ROLLOFF_FACTOR * ((d - a) - (REF_DISTANCE * a)))
  print "a=%f ==> r0=%f  r1=%f" % (a, r0, r1)
  a += 0.1


# a=0.100000 ==> r0=0.571429  r1=0.065898
# a=0.200000 ==> r0=0.571429  r1=0.130293
# a=0.300000 ==> r0=0.571429  r1=0.193237
# a=0.400000 ==> r0=0.571429  r1=0.254777
# a=0.500000 ==> r0=0.571429  r1=0.314961
# a=0.600000 ==> r0=0.571429  r1=0.373832
# a=0.700000 ==> r0=0.571429  r1=0.431433
# a=0.800000 ==> r0=0.571429  r1=0.487805
# a=0.900000 ==> r0=0.571429  r1=0.542986
# a=1.000000 ==> r0=0.571429  r1=0.597015