Hello
Those are markers for your cracks. 1st crack markers are green, and 2nd crack markers are purple. They vary in height, according to the rating you've given each roast (0 to 5 stars).
When you change the criteria selector buttons below the graph, the results of the graph (curves and cracks) will change to match.
When you switch to the analyzer (in "Past Roast" targeting mode), it will show those cracks as an "average" along the bottom axis. The main roast console, though, shows them as individual tick marks.
Enjoy the iPad Pro!
Danny
PS If you don't see the "past" curves there you're expecting to see in the graph, tap the magnifying glass button above the number of matched roasts, and you can change the opacity for past roast curves. It will show the current curves full strength, and the most recent past roast curves as semi-transparent, drawing as many as it can based on the transparency setting, as a means to see how the current roast relates to recent roasts.. That usually works out to be 5-7 of most recent roasts.