Caveat: the scatter plots and stream line/vectors are approximate and the original data is sparse to start with. So the observed properties (not conclusions) require more investigations

Observations:

ONE. The direction of the (laplacian, dT/dt) is more or less fixed and the stream line vectors kinda vibrate around a fixed directions

TWO. Both coordinates could reach small proportions in comparison to the other

THREE. There seems to be a wave-like propagation perpendicular to direction of stream lines/vectors

Dara