# XWUIChartConfidenceBand

A confidence band chart: a fixed-type wrapper around `XWUIChart` that draws a line and
shades a band around it marking the uncertainty or confidence interval at each point,
so the estimate and its margin are read together. Pass `series` of `{ x, y }` data plus
a `block` preset (1-4) and `size` (`sm` / `md` / `lg`); the shared block
config also exposes legend, grid, axis, data-label, and tooltip-formatter toggles. Use
it to show a trend together with how certain each value is.

## Basic Usage

Two monthly `{ x, y }` series fed to the confidence band renderer at the medium size
preset, drawing each line with a shaded interval band around it.

```example
file: examples/BasicUsage.ts
html: examples/BasicUsage.html
title: Basic Usage
description: Two {x, y} series rendered as lines with shaded confidence bands.
```

## Temperature Forecast Band

A ten-day temperature forecast with the expected line bracketed by a widening low/high band.

```example
file: examples/WeatherForecast.ts
html: examples/WeatherForecast.html
title: Temperature Forecast Band
description: A 10-day temperature forecast with the expected value inside a low/high band that widens further out.
```

## Web Traffic Forecast Band

Projected weekly sessions inside a 90% band that fans out as the forecast horizon grows.

```example
file: examples/WebTrafficForecast.ts
html: examples/WebTrafficForecast.html
title: Web Traffic Forecast Band
description: Weekly session forecast with a 90% confidence band that widens as the horizon extends.
```

```api
```