Fig. \ref{946183} shows the amplitude spectrum of shot gather 1200 before filtering (left) and after filtering (right). Notice that before filtering the spectrum present a burst in amplitude at very low frequencies. This low frequency noise has been successfully removed after applying a low pass filter with corner frequencies of 0 and 8 Hz.  Fig. \ref{630662} shows shot 1200 and 1201 before (left)  and after filtering (middle), as well as the difference between them (right) . Notice that only noise has been removed. Fig. \ref{418069} shows  shot gather 1200 and 1201 after filtering (left), after noise suppression (middle) and the difference between them. Notice that only noise has been removed from the data set.