The original signal 
is the sum of Intrinsic Mode Functions (IMFs) and the last residue (
):
is the sum of Intrinsic Mode Functions (IMFs) and the last residue (): 
To obtain accurate results, the key is to add the residue term to the IMFs. Use the “emd” function to store the IMFs and residue from the original signal in variables which can later be used to reconstruct the signal.
For further details refer to the following link:
