We can now evaluate the pressure field with the equivalence

where indicates the reference value of the pressure at infinity (where the flow is uniform).

In the picture the excess nondimensional pressure defined as

is shown.

When circulation is absent, the pressure field is symmetric with
respect to to both the *x* and the *y* axes. On the stagnation
points the excess pressure is positive (which means an action directed
**towards** the body) while on the upper and lower points the excess
pressure is negative (which means an action directed **away** from
the body).

As circulation increases the pressure field is still symmetric with
respect to the *y*-axis but becomes asymmetric with respect to the
*x*-axis.