[yt-users] scale on colourbar?

[Elizabeth Tasker]

Hi,

I'm creating a slice image but it's refusing to tick mark my colour
bar properly:

http://i.imgur.com/YQBWJ.png

pc = PlotCollection(pf, center=position)
p = pc.add_slice("NegEscapeVelocity", 2,
field_parameters={"disk_vector":disk_vector,
"disk_center":disk_center, "disk_radius":profile["DiskRadius"],
"disk_potential":profile["PotentialField"]})
p.set_log_field(False)
p.set_zlim(0.0, 30.0)
p.set_width(8, 'kpc')


Is there something simple I've done wrong? I tried rearranging the
last 3 lines, but to no avail!

Elizabeth