Time: Zoom x4 x2 x1 x1/2 x1/4

$partialdiff sub Y$ in-cell station count for dtr (number/degree_north)

Horizontal Axis Longitude Latitude Time Vertical Axis Longitude Latitude Time $partialdiff sub Y$ in-cell station count for dtr draw ... draw land blank ocean draw coasts countries none colors unlabelledcontours colors | contours contours line dots profile

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