# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0245190        0.00147557    
     0.460000          0.700000         0.0342628        0.00140643    
     0.700000           1.00000         0.0439313        0.00167220    
      1.00000           1.54000         0.0508331        0.00167258    
      1.54000           2.40000         0.0560581        0.00213360    
      2.40000           4.80000         0.0528966        0.00257026    
      4.80000           10.0000         0.0443603        0.00360999