fig = figure(title="Vbars", x_range=FactorRange(factors=coi[lab].tolist()))
fig.y_range.start = 0
fig.vbar(x="x", width=0.5, legend=False, source=source)

fig.vbar(x=coi[lab], width=0.5, legend=False, source=source)

source.data['x'] = coi[lab]
fig.vbar('x', width=0.5, legend=False, source=source)

source.data['foo'] = coi[lab]
fig.vbar('foo', width=0.5, legend=False, source=source)