>Attribute items are in ARC/INFO feature class format.  Additional
>items that were added to the data are:
>
>POLYGON
>
>attribute        description
>=========	===========
>acc_val	      Acceleration value in percent of gravity of the
>                 polygon.  The polygon represents the range of
>                 acceleration values that are contained within its
>                 borders.  The polygon is assigned the lowest value
>                 allowed within the polygon's borders.  The range of
>                 values allowed within a polygon is controlled by the
>                 contours.  Valid values are:  0,2,4,6,8,10,12,14,16,18,
>                 20,30,40,50,60,80,120,160,200
>
>valley		A topological indicator that tells whether the area
>                 contained within the polygon is a local minima (valley)
>                 or not.  A value of "1" indicates the area is a local
>                 minima.
>LINE
>
>attribute 	description
>=========	===========
>acc_val	      Acceleration value in percent of gravity that the
>                 contour represents.  Valid values are: 0,2,4,6,8,10,12,
>                 14,16,18,20,30,40,50,60,80,120,160,200
>
>valley		A topological indicator that tells whether the area
>                 contained within the contour is a local minima (valley)
>                 or not.  A value of "1" indicates the area is a local
>                 minima.

none