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\[
\chi' = \sum_{i=1}^n k_i s_i^2
\]
import plotly.express as px
import plotly.io as pio
df = px.data.iris()
fig = px.scatter(df, x="sepal_width", y="sepal_length",
color="species",
marginal_y="violin", marginal_x="box",
trendline="ols", template="simple_white")
fig.show()