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import numpy as np
import holoviews as hv
hv.extension('matplotlib')
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)
curve = hv.Curve((xs,-(xs-2)**2))
text = hv.Text(0, -30, 'Quadratic Curve')
curve.opts(color='#D3D3D3') * text
For full documentation and the available style and plot options, use hv.help(hv.Text).