Possible orientations for a Time Axis.
Defines a configuration for a Time Axis tier. For details on how ticks are generated see: https://github.com/mbostock/d3/wiki/Time-Scales#ticks interval - A time unit associated with this configuration (seconds, minutes, hours, etc). step - number of intervals between each tick. formatter - formatter used to format tick labels.
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An array of linked TimeAxisTierConfigurations. Each configuration will be shown on a different tier. Currently, up to two tiers are supported.