In this case you don't need to generate any array at all. Just use a waveform graph (not chart or x-y) and do one of the following:
(1) If this value remains fixed during the program execution, just ring-click on the graph and select x-scale..formatting and enter you x0 and dx. dx would be 635e-6. On the right, change the formatting ot e.g. engineering notation as needed.
(2) If you need programmatic control over this, create a property node for the graph (right-click..create..property node), set it the "change all to read" and select property "Xscale..offset and multiplier...multiplier". Now wire your the increment/point (625e-6) to the multiplier terminal.