rockyplum

Results 2 issues of rockyplum

Now it is visualized strangely list this ![image](https://user-images.githubusercontent.com/24423434/183000288-5fb382b9-2f52-4ce3-9151-446beb53c558.png)

in `get_ecg_f_from_file `, there is a mistake in ``` ECG_neutral = np.array(df["signal"]["chest"]["ECG"][indice_neutral[0]:indice_neutral[-1]*700][:,0]) #Baseline ``` You should not `* 700`.