Add surface information: how to add extra values?

[AlisonCook]

Hello - I have used the 'Add surface elevation' tool to obtain details such as mean, max, min elevation and slope values from my DEM, using polylines. This has been successful and I'm happy with the resulting values. However, I was wondering how to extract further details from the DEM along these lines. For example, I'd like to know the 'median' surface elevation. With the same tool there seems to be an option 'Add values' but this is greyed out and I can't find how to access this using ArcGIS Help. I wonder if this would enable me to make further calculations, and if so how do I access this extra function? Thanks for any advice!

[JeffreySwain]

There are the following stats that can be added:
Z �??Surface elevation interpolated for the XY location of each single-point feature.
Z_MIN �??Lowest surface elevation in the area defined by the polygon, along the length of a line, or among the interpolated values for points in a multipoint record.
Z_MAX �??Highest surface elevation in the area defined by the polygon, along the length of a line, or among the interpolated values for points in a multipoint record.
Z_MEAN �??Average surface elevation of the area defined by the polygon, along the length of a line, or among the interpolated values for points in a multipoint record.
SURFACE_AREA �??3D surface area for the region defined by each polygon.
SURFACE_LENGTH �??3D distance of the line along the surface.
MIN_SLOPE �??Slope value closest to zero along the line or within the area defined by the polygon.
MAX_SLOPE �??Highest slope value along the line or within the area defined by the polygon.
AVG_SLOPE �??Average slope value along the line or within the area defined by the polygon.

The 'Add Value' button does not appear to have an effect and is not listed in the help as being active.  If you would like additional ones added to this list, then I would suggest making that an 'idea' on the ArcGIS Ideas page.  With enough support, the enhancement could possibly be considered.

[AlisonCook]

Thank you for your reply. It would be useful to be able to add additional values so I'll add this to the Ideas page as you suggest.
Thanks,
Alison