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This is Fig. 1b from the 2013 GENOPT paper2.
Fig. 1(b) Decision variable candidates for (A) Segments 1 and 2 of the aft skirt and (B) Segments 4 and 5 of the aft skirt. In the “twoskirt” case there are two skirts, an aft skirt and a forward skirt. The forward skirt slants outward with increasing meridional distance, as shown in Fig. 8a, instead of inward with increasing meridional distance, as shown here. What are called “Segment 1” and “Segment 2” of the aft skirt in (A) above become, respectively, “Segment 5” and “Segment 4” of the forward skirt, and what are called “Segment 4” and “Segment 5” of the aft skirt in (B) above become, respectively, “Segment 2” and “Segment 1” of the forward skirt. As seen from Table 1, the variables, LNGVEH1, THKVEH1, LNGVEH2, THKVEH2, LNGTNK1, THKTNK1, LNGTNK2, THKTNK2, are arrays with dimension 2. The first element in the arrays, for example THKVEH1(1) and THKVEH2(1), corresponds to the aft skirt, and the second element in the arrays, for example THKVEH1(2) and THKVEH2(2), corresponds to the forward skirt.
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