SL by Gap-Support /Resistance

NASDAQ:BLDP   Ballard Power Systems, Inc
Have a look how excemplaric gap lines first work as resistance, then as support, here . The degree of relevance of the gaps are can be seen by the line's cross:
It is correlating (on time axis) with the start of a new upswing (vertical line). Splendid, at least for my eyes!