# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0232507        0.00656062    
     0.460000          0.700000         0.0145156        0.00672467    
     0.700000           1.00000         0.0212444        0.00555739    
      1.00000           1.54000         0.0223540        0.00491979    
      1.54000           2.40000         0.0358829        0.00474390    
      2.40000           4.80000         0.0287300        0.00610689    
      4.80000           10.0000         0.0140371         0.0136650