Fig. 7
a, b: Two distinct realizations of alphabet symbol “ε” appearing in “FYSAP”: the one in sub-figure a is considered to be the prototype-fixed one, while the realization in b is the current one; c Optimal matching of these two realizations, on the basis of the analysis introduced in the present sub-Sect. 3.2. We emphasize that the intersection of the bodies of the two letters is shown in black, while their union is depicted in degradations of grey; for completeness, in the figure we have added the two letters’ contours, each one with its color in a, b