The x-axis represents the %abv. Optionally, those in the boiler or those in the current distillate.
The y-axis represents the volatilities of the congeners. The + and - keys can be used to increase or decrease the displayed area.
The curves of ethanol (black) and water (blue) are displayed somewhat thicker
Different types of display can be selected. The view of the volatility related to the mole fraction is the most scientific one. More practical, however, is the volatility in terms of grams per liter.
Often volatility data are shown in comparison to the volatility of ethanol, which is much more interesting for practice than the absolute volatility. This comparative volatility can also be presented here. And it can be compared not only with ethanol, but with any substance. For example, it can be shown how good-aromatic congeners behave compared to bad-aromatic congeners from the same group of congeners. For example, complex esters compared with the simple and poorly aromatic ester ethyl acetate.
With a mouse click on one of the diagrams the values can be displayed at the cursor.
If the cursor is moved over a button of a congener without pressing, other names and also further information about this congener are displayed.
The congeners are ordered within their group (for example "esters") according to their molar mass. So on the far left is the smallest ester (ethyl acetate) and in the second row on the far right is the largest (ethyl caprinate). In general terms, within a group of congeners, the larger molecules are those with the better aroma or those from which the more interesting aromas can be created.

More information about congeners and calculation examples
Information about our boiling point data