# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0484784        0.00195976    
     0.460000          0.700000         0.0484418        0.00193415    
     0.700000           1.00000         0.0456482        0.00228386    
      1.00000           1.54000         0.0457381        0.00214371    
      1.54000           2.40000         0.0400420        0.00292484    
      2.40000           4.80000         0.0374813        0.00339114    
      4.80000           10.0000         0.0184394        0.00714358