CONTOURS contains observations with values of X ranging from 0 to 400 by 5 and with values of Y ranging from 0 to 350 by 10. 
                       CONTOURS Data Set                       1
                   First 5 Observations Only

                            Z    X     Y

                         46.2    0     0
                         47.2    0    10
                         48.0    0    20
                         48.8    0    30
                         49.4    0    40