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/// An enumeration representing the format for value exponents on the axis.
///
/// # Example
///
/// ```rust
/// use polars::prelude::*;
/// use plotlars::{Axis, Plot, TimeSeriesPlot, ValueExponent};
///
/// let dataset = LazyCsvReader::new(PlRefPath::new("data/revenue_and_cost.csv"))
/// .finish()
/// .unwrap()
/// .select([
/// col("Date").cast(DataType::String),
/// col("Revenue").cast(DataType::Int32),
/// col("Cost").cast(DataType::Int32),
/// ])
/// .collect()
/// .unwrap();
///
/// TimeSeriesPlot::builder()
/// .data(&dataset)
/// .x("Date")
/// .y("Revenue")
/// .y_axis(
/// &Axis::new()
/// .value_exponent(ValueExponent::SmallE)
/// )
/// .build()
/// .plot();
/// ```
///
/// 