# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0254902        0.00615244    
     0.460000          0.700000         0.0502247        0.00515703    
     0.700000           1.00000         0.0541766        0.00608615    
      1.00000           1.54000         0.0710581        0.00559047    
      1.54000           2.40000         0.0577992        0.00629479    
      2.40000           4.80000         0.0644718        0.00717265    
      4.80000           10.0000         0.0312696        0.00968995