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No problem! I love answering questions!

Here is the graph (for convenience):

The series of reactions we are concerned with is:

THCA + heat --> THC + heat --> CBN

THCA is an undesirable compound in any type of edible since it is inactive (as stated in the article, it's too polar to cross the blood brain barrier effectively). Thus, one wishes to convert THCA to THC. Like THC, CBN is also an active compound – but much less so that THC. Accordingly, in the process, one wishes to maximize the yield of THC (which occurs at the maxima of the curves).

Looking at the graph, the concentration of THC is along the y-axis while heating time (at the stated temperature) is represented on the x-axis. Let's pick out the 122C curve to use as a model example of how to interpret the others.

Let's visualize the experiment. We begin with a solution of cannabis extract and begin heating it. At first, the THC concentration is relatively low (3 mg THC per g of solution). However, as we begin to heat it (at a constant temperature – here 122C), the THCA begins to undergo decarboxylation – thereby converting it to THC. As time passes, the THC content begins to rise. However, simultaneously, THC is being converted to CBN. So, as the THCA is consumed, less and less of THC is produced while more and more CBN is made. As a result, the curve eventually reaches a maximum after 27 minutes of heating (where the supply of THCA is becoming exhausted), and the amount of THC begins to decline as heating continues (converting it to the less active CBN).