Does anyone know how to correct for reddening in a CC-diagram?

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To correct for reddening in a color-color (CC) diagram using the provided spectrum, the color excess ratios must be applied to adjust the observed magnitudes. The magnitudes at the specified wavelengths (3.6, 4.5, 5.8, and 8.0 micrometers) need to be modified based on the corresponding color excess ratios of 0.39, 0.47, 0.56, and 0.555. This involves calculating the corrected magnitudes by applying the reddening values to account for the effects of interstellar dust. Understanding how to apply these ratios effectively is crucial for accurate placement in the CC diagram. Properly correcting for reddening will enhance the reliability of the spectral analysis.
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I have an observed spectrum for an object (magnitudes at 4 wavelengths) and need to correct for reddening before placing the object in a CC diagram... I have some color excess ratios, but I am not sure how to use them...
 
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Specifically:

My spectrum measured by Spitzer at wavelengths:
lambda (mu m): 3.6, 4.5 ,5.8 and 8.0
magnitude (mag): 12.954, 13.015, 13.091, 12.917

The color excess ratios defined through E(Ks −[lambda])/E(J−H) at each lambda are:
0.39, 0.47, 0.56, 0.555

I am not sure how to use this.
 

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