What happened to the NYSE $TICK?

When I compare $TICK and $TICKC on TS, I see the divergence has been gradual over the last 3 or so months, not suddenly as I was expecting.

My hypothesis is that NYSE Direct electronic trading is being counted as "regional" tick and as this volume increases so does the difference between $TICK and $TICKC. Before the hybrid system the regional volume was small enough that the two indicators were relatively close.

Can anyone confirm/deny this?
 
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