Checking phi-gridding

Section by section, show:

• BLACK: Original vertically-integrated crosstrack current. Dive-by-dive values plotted vs phi
• RED: Same current gridded on phi (51 steps of 0.02 phi) (Checks grid-on-phi algorithm)
• GREEN: Current scaled by ds/dphi to get Q

Note different units:
Black and red are simply the vertically-integrated current (m2/s).
Green are in Q units: Sv/unit phi.

Values in bottom label are the estimated coast-to-coast transport (Sv), plotted here:

Also see time series of coast-to-coast transport including annual, interannual, differences etc