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import numpy as np
import holoviews as hv
from holoviews import opts
hv.extension('bokeh')
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opts.defaults(opts.Curve(color='#D3D3D3'))
The Text annotation is used to overlay text at a particular position on a plot:
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xs = np.linspace(-5,5,100)
hv.Curve((xs,-(xs-2)**2)) * hv.Text(0, -30, 'Quadratic Curve')
For full documentation and the available style and plot options, use hv.help(hv.Text).