axis.tickSizeOuter([size]) If size is specified, sets the outer tick size to the specified value and returns
axis.tickValues([values]) If a values array is specified, the specified values are used for ticks rather than
axis.tickSize([size]) If size is specified, sets the
axis.ticks(arguments…) axis.ticks([count[, specifier]]) axis.ticks([interval[, specifier]])
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