Update coupe_common.rst_. Default value of -A+w

[Esteban82]

The default value for -A+w is it 0, right? I add it. Not sure if the description is clear enough.

[PaulWessel]

I am not sure, adding @seisman to opine.

[seisman]

In the new syntax, it seems p_width is uninitialized if +wwidth is not given. Does p_width=0 mean that no beachball will be plotted?

[PaulWessel]

All Ctrl variables are zero an NULL when initialized, so yes p_width will be zero unless set. I just don't know if that means nothiing is plotted.

[seisman]

@Esteban82 What will happen if +wwidth is not given?

gmt/src/seis/pscoupe.c

Lines 1132 to 1134 in fcd0f36

	if (!pscoupe_dans_coupe (in[GMT_X], in[GMT_Y], depth, Ctrl->A.xlonref, Ctrl->A.ylatref, Ctrl->A.fuseau, Ctrl->A.PREF.str,
	Ctrl->A.PREF.dip, Ctrl->A.p_length, Ctrl->A.p_width, &distance, &n_dep) && !Ctrl->N.active)
	continue;

As I understand the codes, the beachball will always be skipped when p_width is uninitialized (=0).

[Esteban82]

Without +w no beachball was plot.

[seisman]

I think the default behavior is useless. Can we change it to infinity (means all beachballs are plotted by default)?

[PaulWessel]

Yep, that is much better. I can do that.

[PaulWessel]

Hi @Esteban82 I guess you can delete this branch as I did the +w default in another. Please give it a try to ensure the default (infinity) works as you expect.