# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.149037        0.00575749    
     0.460000          0.700000          0.142661        0.00579839    
     0.700000           1.00000          0.167660        0.00717165    
      1.00000           1.54000          0.133183        0.00715409    
      1.54000           2.40000          0.144312        0.00932087    
      2.40000           4.80000          0.124141         0.0117411    
      4.80000           10.0000          0.102636         0.0167882