# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0867431         0.0262843    
     0.460000          0.700000         0.0315766         0.0319267    
     0.700000           1.00000         0.0669969         0.0160906    
      1.00000           1.54000         0.0923019         0.0238127    
      1.54000           2.40000         0.0540944         0.0503798    
      2.40000           4.80000         0.0690376         0.0196449    
      4.80000           10.0000          0.127179        0.00950049