Properties of the maser feature E in Fig. 8, with the same coloring scheme. Top: feature line profile. The symbol diameters are proportional to s_υ (two are very small); the error bars show the size uncertainty σ_s. Bottom: detailed map of the components comprising the feature. The diameter of each symbol is 10% of s_υ and the error bars represent the position offset uncertainties. The thin black line joins the components in velocity order. The long thin red line denotes the largest angular size l of the feature. The short fat red line shows the separation of the components with flux densities closest to the half-maximum of the feature, d. The expanded-scale inset (total size 1.7 × 1.2 mas, ticks at 0.2 mas intervals) shows the area in the pink box, which contains the components brighter than half maximum, with component size error bars. The brightest component is outlined in red, also marked on the top plot.