# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.113453         0.0157509    
     0.460000          0.700000          0.184284         0.0113152    
     0.700000           1.00000          0.216629        0.00703353    
      1.00000           1.54000          0.247077        0.00362534    
      1.54000           2.40000          0.247847        0.00321139    
      2.40000           4.80000          0.241685        0.00327952    
      4.80000           10.0000          0.206756        0.00414912