Figure 2
Interaction function at zero spike width. (
) Profile of type 1 PRC with
, at five different skewness values. (
) Analytically determined
[Eq. (
9)] for the five PRCs of (
). The dashed curves for
, 0.3, 0.5, and
are Fourier approximations in Eq. (
A1). For
up to eight modes are needed, but the curve is plotted using only four modes in order to compare with the other curves. In the side panels the coefficients of cosine terms [
) and the sine terms [
] in the discrete Fourier spectrum of
for the first three modes are displayed for all levels of skewness. The side panel also displays
for
, 2, 3, and 4 as a function of normalized skewness. (b
) Profile of type 2 PRC at four different levels of
and fixed skewness of
. (b
)
for the PRCs in b
using Eq. (
7) (solid) and Fourier approximations [dashed, Eq. (
A2)]. The side panels are similar to those in b
but as a function of type parameters at
. (c) The weight factor
that captures the relative Fourier power in modes 1 to
in the parameter space of skewness and
as incrementally more number of modes are included in an expression for
in terms of its Fourier expansion terms. The black dots indicate the contour lines on which
. The brighter yellow parameter regimes bordering the dotted boundaries can be represented by the given or fewer number of Fourier modes and contain
or more total power in them. For example, in the region marked
in the last panel the IF could be approximated by either four or fewer modes.
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