surface plots

[Andreas J Guelzow <aguelzow@math.concordia.ab.ca>]

Regarding chart:class specified plots:

surface – The values of multiple <chart:series> (marked as being of type
chart:surface) are interpreted as a 'altitude' at a specific grid
location. The graph may visualize these using colors for height
intervals, creating color bands.

do I understand this as:
<chart:series chart:values-cell-range-address="S1.$C$1:S1.$C$16">
    <chart:domain table:cell-range-address="S1.$A$1:S1.$A$16"/>
    <chart:domain table:cell-range-address="S1.$B$1:S1.$B$16"/>
</chart:series>

or

<chart:series chart:values-cell-range-address="S1.$A$1:S1.$A$16" />
<chart:series chart:values-cell-range-address="S1.$B$1:S1.$B$16" />
<chart:series chart:values-cell-range-address="S1.$C$1:S1.$C$16" />

where C1 gives the altitude at x=A1, y=B1 or 

even as something else.

Thanks

Andreas

-- 
Andreas J. Guelzow
Concordia University College of Alberta