# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0151362        0.00529320    
     0.460000          0.700000         0.0176519        0.00438361    
     0.700000           1.00000         0.0148760        0.00528498    
      1.00000           1.54000         0.0174843        0.00445512    
      1.54000           4.80000         0.0100222        0.00609896    
      4.80000           10.0000         0.0332910        0.00871417