The 'Chartres fragment' (a part of MS Athos, Laura Gamma 67, early 11th cent.) was destroyed during the bombing of Chartres in May 1944. Fortunately, most of the fragment was photographed before that and a microfilm is now kept in the MMB collection.
Here is the sticheron "He sophia tou theou" of the fourth plagal mode from fol. 65v.