Progression Plots ...

The left panel shows the number of sorted galaxies as a function of time (this includes all visits - practice, training, calibration, etc.). The blue curve is the contribution of everyone and the orange one is the contribution of amateurs.
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The right panel shows the statistics of the sorted galaxies.The blue bar  represents the total number of candidates in our catalog. The red column shows how many galaxies have at least one measurement. The yellow and green bars display the number of galaxies with at least 2 and 3 measurements, respectively.