# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0867207         0.0168032    
     0.460000          0.700000          0.125411         0.0114008    
     0.700000           1.00000          0.151177        0.00698316    
      1.00000           1.54000          0.170227        0.00346722    
      1.54000           2.40000          0.159846        0.00300730    
      2.40000           4.80000          0.158950        0.00304042    
      4.80000           10.0000          0.140593        0.00420069