2: The three map layers are named as follows: oase_n27f: polyline coverage containing the surface effects map features oase_bar_n27f: polyline coverage containing the bars of the bar-and-ball symbols oase_ball_n27f: point coverage containing the balls of the bar-and-ball symbols
3: The bar-and-ball symbols are used to illustrate vertical displacement on the down-thrown side of faults and vertically displaced cracks. The ball symbols (point coverage) contain an attribute field named OFFSET_CM. This field contains a numerical value that is used to label the fault symbols. The value indicates the amount of vertical offset (in centimeters) that was originally measured for these features.