Whether the value axis is logarithmic: nothing is drawn at zero or below.
What every ECharts series of the group states: its id and name, axes, data and no emphasis.
A series' data as ECharts places it: by category index, or on a date axis as [slot, value]
pairs; a log axis's zero and negative values dropped.
A group on the grid's axes: where its series go and how their data is placed.