'Adding a line to a Pandas plot

I'm currently tracking my internet speed and want to generate a plot of my measurements with a Timestamp, Upload value and Download value.

I'm using this to create the plot

df.plot(
    kind='line', 
    x=timestamp_column_name, 
    y=[download_column_name, upload_column_name],
    figsize=(12,5)
)

Generated plot:

Now I would like to add a line to this plot with the constant height of y=100000 but I can't figure out how to do this correctly. How should I do this with Pandas?

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Solution	Source

'Adding a line to a Pandas plot

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