Figure 3.
Illustration of the conditions (24) and (25). The regions are marked as follows: (+): dΩpeak/dΩ > 0, dΩpeak/dR > 0; (∓): dΩpeak/dΩ < 0, dΩpeak/dR > 0; (−): dΩpeak/dΩ < 0, dΩpeak/dR < 0; (±): dΩpeak/dΩ > 0, dΩpeak/dR < 0.
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