Coordinates That Pinpoint a Position on a Graph

This page is the CodyCross answer for the clue below from All Things Water, Group 1295, Puzzle 2 (Thunderstorms).

Question is: Coordinates That Pinpoint a Position on a Graph

and the answer is: CARTESIAN

Word Meaning:

CARTESIAN — (mathematics) Alternative letter-case form of Cartesian.

Definitions from Wiktionary.