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The User has to select 'Phase' and 'P' options from the fields 5 and 6 of Figure 2 for the vertical component of a station (**Z channel) and 'Phase' and 'S' options from the fields 5 and 6 of Figure 2 for one of the Horizontal components of a station (**N or **E channel). Then he/she has to pick the starting and ending point that wishes to use in Spectral Analysis (Figure 3).

Figure 3. Phase picking demonstration for S (upper frame) and P (lower frame) waves

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