[Gmsh] degree of Splines and BSplines, parabolic arc

[Marcella Bonazzoli]

Hi,

I'm trying to build a Parabolic arc as a piece of my domain boundary.
To make this, I think I should use the geometry commands Spline or BSpline.
I've read in the Manual that I can give the control points, with a 
certain multiplicity.
Which is the order/polynomial degree of the obtained spline/B-spline?
(For example, how can I get the parabola having a certain vertex and 
passing through other two points?)

Thanks in advance for your help.
Best regards,

Marcella