# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0609103        0.00527016    
     0.460000          0.700000         0.0443513        0.00566157    
     0.700000           1.00000         0.0520590        0.00810355    
      1.00000           1.54000         0.0556404        0.00922173    
      1.54000           2.40000         0.0464211         0.0160867    
      2.40000           10.0000         0.0337848         0.0195268