The pol argument in lamb.

This selects a sign convention. In addition, if pol=0 (Test Mode), then the 1/R amplitude decay is also removed (as was the case in computing Figure 52). If pol=-1, then an upward motion produces a negative value (the SEG sign convention). Setting pol=+1 reverses the sign convention (upward motion produces a positive number). Interpreting pol for horizontal motion is much more confusing. In real life, one must keep track of the direction to the source, and the relative orientation of a geophone element, and how it is wired. Basically, if pol=0 or pol=+1, then the sign convention of the motion is as shown in Figure 52. If pol=-1, then it is the reverse of what is shown in Figure 52. In that figure, the word ``away'' means motion away from the source location (in the direction of increasing distance away from the source).