Fig. 13

Comparison between the exact result for the standard deviation (solid lines) and the approximate expression (dashed lines) that depends explicitly on \(\langle \varphi \rangle\), J, and L [Eq. (84)].

Comparison between the exact result for the standard deviation (solid lines) and the approximate expression (dashed lines) that depends explicitly on \(\langle \varphi \rangle\), J, and L [Eq. (84)].