# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.215133        0.00309672    
     0.460000          0.700000          0.221246        0.00366620    
     0.700000           1.00000          0.217693        0.00446885    
      1.00000           1.54000          0.204088        0.00579257    
      1.54000           2.40000          0.190507        0.00879558    
      2.40000           4.80000          0.180816         0.0154488    
      4.80000           10.0000          0.169835         0.0297901