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Line chart with plotly and streamlit

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Hello, i appreciate your help in the below

i am trying to plot a line chart with date (month and year ) on X axis and 2 lines , one for radiology fees and one for lab fees … but i need the total monthly amount to appear on the line chart for each radiology and lab … how can i do that ?
i wrote the following

dff4=dff1[[‘date’,'Radiology ','Lab_charges ']]
dff4=dff4.set_index(‘date’)
st.line_chart(dff4)

thanks