The most commonly-used kind of subplot is a two-dimensional Cartesian subplot. Traces compatible with these subplots support xaxis and yaxis attributes whose values must refer to corresponding objects in the layout portion of the figure. For example, if xaxis="x", and yaxis="y" (which is the default) then this trace is drawn on the subplot at the intersection of the axes configured under layout.xaxis and layout.yaxis, but if xaxis="x2" and yaxis="y3" then the trace is drawn at the intersection of the axes configured under layout.xaxis2 and layout.yaxis3. Note that attributes such as layout.xaxis and layout.xaxis2 etc do not have to be explicitly defined, in which case default values will be inferred. Multiple traces of different types can be drawn on the same subplot. X- and Y-axes support the type attribute, which enables them to represent continuous values (type="linear", type="log"), temporal values (type="date") or categorical values (type="category", type="multicategory). Axes can also be overlaid on top of one another to create dual-axis or multiple-axis charts. 2-d cartesian subplots lend themselves very well to creating "small multiples" figures, also known as facet or trellis plots. The following trace types are compatible with 2D-cartesian subplots via the xaxis and yaxis attributes: - scatter-like trace types: scatter and scattergl can be used to draw scatter plots, line plots and curves, time-series plots, bubble charts, dot plots and filled areas and also support error bars - bar, funnel, waterfall: bar-like trace types which can also be used to draw timelines and Gantt charts - histogram: an aggregating bar-like trace type - box and violin: 1-dimensional distribution-like trace types - histogram2D and histogram2Dcontour: 2-dimensional distribution-like density trace types - image, heatmap and contour: matrix trace types - ohlc and candlestick: stock-like trace types - splom: multi-dimensional scatter plots which implicitly refer to many 2-d cartesian subplots at once.