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waterfall graph

I am attempting to create a waterfall graph containing a power spectrum over time.  The spectrum is being graphed in the y-z plane with elapsed time along the x axis.  The problem I am having is with the time.  Time data is in an array.  That array is connected to the  x vector terminal on the plot helper.  What I am seeing on the graph is not time but rather the number of data points in the array.  What I have read is that if nothing is connected to the x and y terminals of the plot helper then the graph will use index values from the z matrix as the data for the x and y axis.  It seems like this is what is happening even though I am supplying x values.  Any ideas why this is happening? Thanks!

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Problem solved. Turns out both x and y must be connected or neither one will be recognized.

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