Plot 2 Dataframes in one Figure in Pandas

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Hey I want to plot 2 DataFrames in one Figure in Pandas.

My DataFrame(s) look like this(excerpt from DataFrame):

       Timestamp  Distance     Speed  Heart Rate   Pace
1          0.0      3.02  2.353079          89  425.0
2          1.0      5.10  1.847000          92  541.0
3          2.0      7.48  1.969000          96  508.0
4          4.0     14.13  2.902000          93  345.0
5         10.0     28.01  2.967000          96  337.0
6         11.0     30.96  2.995000         101  334.0
7         12.0     33.79  2.995000         104  334.0
8         13.0     36.56  2.967000         114  337.0

They both have different number of items but otherwise have the same format.

Right now it looks like this

and I am plotting it with this code.

ax = dataframe1[['Speed','Heart Rate','Pace']].plot(subplots=True,
                                               title=['Speed in m/s','Heart Rate in bmp','Pace in min/km',],
                                               x=dataframe1['Timestamp'],)

What I want to do now is to plot the HeartRate from DateFrame2 in the same subplot as the HeartRate from DataFrame1 (in a different color) but I don't know how .

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