# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.285929        0.00183003    
     0.460000          0.700000          0.323153        0.00183767    
     0.700000           1.00000          0.356698        0.00196523    
      1.00000           1.54000          0.387496        0.00203000    
      1.54000           2.40000          0.377992        0.00272237    
      2.40000           4.80000          0.357379        0.00355915    
      4.80000           10.0000          0.313002        0.00548477