# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000          0.106646         0.0156521    
     0.700000           1.00000          0.150058        0.00662229    
      1.00000           1.54000          0.147460        0.00394678    
      1.54000           2.40000          0.131430        0.00367034    
      2.40000           4.80000          0.135631        0.00372851    
      4.80000           10.0000          0.118069        0.00567007