# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00795964        0.00301867    
     0.460000          0.700000         0.0149080        0.00274491    
     0.700000           1.00000         0.0188812        0.00284300    
      1.00000           1.54000         0.0142221        0.00300110    
      1.54000           2.40000         0.0131555        0.00403338    
      2.40000           4.80000         0.0156752        0.00464281    
      4.80000           10.0000        0.00149029         0.0107951