Mid-key values give Marie Duhem its characteristic quietness - nothing blazes, nothing disappears. Cool tones set the register here - the blues and greens easily outweigh any warm accents. Chroma hovers near zero; colour declares itself through subtle shifts in hue rather than outright saturation. The highest-chroma note - #C5B98C - appears at just 4.0%, deployed as a precision accent against the quieter ground. Value range is moderate at 42 units - enough contrast for legibility, not so much as to fragment the tonal unity. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. The palette is recognisably Marie Duhem's own: particular in its temperature, chroma, and the economy of its brightest note.