# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0195905         0.0142222    
     0.460000          0.700000         0.0183304         0.0105282    
     0.700000           1.00000         0.0428920        0.00998717    
      1.00000           2.40000        0.00443408         0.0181470    
      2.40000           4.80000         0.0282603        0.00710436    
      4.80000           10.0000         0.0305836        0.00334477