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Efficiency function

from numpy import *
def f(e_prime):

      if e_prime>19:
           return 1.
      elif e_prime<19 and e_prime >= 16.2:
           return 0.8645505541113695
     elif e_prime < 16.2 and e_prime >= 15.5:
           return 0.737173347927213
     elif e_prime < 15.5 and e_prime >= 15.0:
           return 0.6029552606375701
      elif e_prime < 15.0 and e_prime >= 12.9:
           return 0.4702421671911342
      elif e_prime < 12.9 and e_prime >= 12.3:
           return 0.3566835408400602
      elif e_prime < 12.3 and e_prime >= 12.1:
          return 0.23204268709809822
     elif e_prime < 12.1 and e_prime >= 10.2:
          return 0.12108359556710904
     elif e_prime < 10.2:
          return 0.