Graph labels are off a bit, should be centered on the spot where they are displayed

Sample patch attached: graph-labels.pd

Here's how the patch looks like in vanilla:

Note how the labels are centered relative to the ticks.

In Purr Data they are offset upwards and to the right:

Looks like they are aligned with the reference point below and left of the label, so that they look misaligned. Of course, it's possible to fix the y alignment of the x labels and the x alignment of the y labels by adjusting the coordinate values in the first argument of the corresponding xlabel/ylabel message, but that's awkward, introduces an incompatibility with vanilla for no good reason, and in any case doesn't help with the horizontal placement of x and the vertical placement of y labels for which there is no such work-around.

It's a minor issue, but to a mathematician's eye this just looks wrong. ;-) Is there a way to fix that?