How to apply a low-pass filter of 5Hz to a pandas dataframe?
Perhaps I am over-simplifying this but you create a simple condition, create a new dataframe with the filter, and then create your graph from the new dataframe. Basically just reducing the dataframe to only the records that meet the condition. I admit I do not know what the exact number is for high frequency, but let's assume your second column name is "Frequency"
condition = df["Frequency"] < 1.0low_pass_df = df[condition]low_pass_df.plot(legend=True, use_index=False, color='red')