# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.167807        0.00950446    
     0.460000          0.700000          0.151462        0.00938328    
     0.700000           1.00000          0.183636         0.0139622    
      1.00000           1.54000          0.335765         0.0245613    
      1.54000           2.40000          0.258989         0.0536292    
      2.40000           4.80000          0.302289         0.0667548    
      4.80000           10.0000          0.306621          0.117305