# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0921615        0.00286341    
     0.460000          0.700000          0.104537        0.00310461    
     0.700000           1.00000          0.111600        0.00369510    
      1.00000           1.54000          0.119582        0.00358454    
      1.54000           2.40000          0.121200        0.00425610    
      2.40000           4.80000          0.100065        0.00561322    
      4.80000           10.0000         0.0796099        0.00910751