# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0169887        0.00206199    
     0.460000          0.700000         0.0168280        0.00184433    
     0.700000           1.00000         0.0182883        0.00222201    
      1.00000           1.54000         0.0205913        0.00183953    
      1.54000           2.40000         0.0193106        0.00206272    
      2.40000           4.80000         0.0178593        0.00231490    
      4.80000           10.0000         0.0200754        0.00309626