# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00209067         0.0304412    
     0.460000          0.700000         0.0318558         0.0121435    
     0.700000           1.00000         0.0491150         0.0145279    
      1.00000           4.80000        0.00363364        0.00780978    
      4.80000           10.0000         0.0229052        0.00760242