The figure is a bar chart titled “Distribution of reported MDMA doses (all non-missing responses).” Along the horizontal axis, the total MDMA dose per session is shown in milligrams, increasing from about 0 to 1000 mg. The vertical axis shows how many people reported each dose. Most bars cluster tightly between roughly 100 and 250 mg, forming a single tall peak centered around 200 mg where the highest bar reaches just over 120 reports. Counts drop off quickly on either side of this peak: there are smaller numbers of reports between about 50 and 100 mg and between 250 and 350 mg. Only a handful of people report very high doses above 400 mg, with isolated bars around 400, 500, 600, 800, and 1000 mg each representing just a few responses. Overall, the distribution is strongly right-skewed, with most reported sessions in the 100–250 mg range and rare but extreme high-dose outliers.
I'm analyzing some data collected with an online questionnaire a few years ago. We asked about typical dose and out of 568 responses, only about 2.8% said they typically used under 70 mg. Unclear if what is survey noise or people who don't know what they are taking.