Functions rou<#353#>plbin<#353#> and <#540#>plhist<#540#> (page #plhist#541>) are provided for
drawing histograms, and functions rou<#355#>plerrx<#355#>
and <#542#>plerry<#542#> (page #plerry#543>) draw error bars about specified
points. They are described in detail in Chapter #reference#357>.