# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0323331        0.00359704    
     0.460000          0.700000         0.0288589        0.00325201    
     0.700000           1.00000         0.0306993        0.00357183    
      1.00000           1.54000         0.0349681        0.00381168    
      1.54000           2.40000         0.0328622        0.00444867    
      2.40000           4.80000         0.0350181        0.00546020    
      4.80000           10.0000         0.0183564        0.00876235