# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0936420        0.00319695    
     0.460000          0.700000         0.0850068        0.00324693    
     0.700000           1.00000         0.0850367        0.00397887    
      1.00000           1.54000         0.0740018        0.00429195    
      1.54000           2.40000         0.0908003        0.00553743    
      2.40000           4.80000         0.0787269        0.00726502    
      4.80000           10.0000         0.0796057         0.0113107