$EREF$plot2 module <folding>

This module defines the folding that may be applied to
all the data sets.  The x direction and y direction
have their own separate sections.
$<DL>$
$<DT>${x direction: folding} <x_fold>$<DD>$
This determines whether the x region is folded, and
if it is whether it is wrapped or reflected at each
boundary.

$<DT>${x direction: peak flip} <x_flip>$<DD>$
This determines whether folded peaks with an odd
number of folds are flipped in sign.

$<DT>${x direction : width} <x_width_min, x_width_value, x_width_max>$<DD>$
The width of the folding region.
The units are the same as the region is using.

$<DT>${x direction : center} <x_center_min, x_center_value, x_center_max>$<DD>$
The center of the folding region.
The units are the same as the region is using.

$<DT>${y direction: folding} <y_fold>$<DD>$
This determines whether the y region is folded, and
if it is whether it is wrapped or reflected at each
boundary.

$<DT>${y direction: peak flip} <y_flip>$<DD>$
This determines whether folded peaks with an odd
number of folds are flipped in sign.

$<DT>${y direction : width} <y_width_min, y_width_value, y_width_max>$<DD>$
The width of the folding region.
The units are the same as the region is using.

$<DT>${y direction : center} <y_center_min, y_center_value, y_center_max>$<DD>$
The center of the folding region.
The units are the same as the region is using.

$<DT>${apply} <apply>$<DD>$
Calculate the contours and display the result.
The current parameters (e.g. the region and contour
levels) as defined are the ones used.

$<DT>${dismiss}$<DD>$
Close the module (the parameters are remembered).

$<DT>${help}$<DD>$
Display this message.
$</DL>$
