siarproportionbysourceplot: siar proportion plots by source
In siar: Stable Isotope Analysis in R

Useful for siar data with multiple groups where the variability of each source over time is of interest.

1	siarproportionbysourceplot(siardata, siarversion=0,probs=c(95,75,50),xlabels=NULL, grp=NULL, type="boxes",clr=gray((9:1)/10),scl=1,xspc=0,prn=FALSE,leg=FALSE)

`siardata`	A list containing some or all of the following parts: targets, sources, corrections, PATH, TITLE, numgroups, numdata, numsources, numiso, SHOULDRUN, GRAPHSONLY, EXIT, and output. For more details of these inputs see the `siarmenu` function.
`siarversion`	The siar version number.
`probs`	Define the extent probability intervals for a given parameter.
`xlabels`	Specifies the text to associate with each group defined as ticks on the x-axis.
`grp`	Specifies which source group the graph is drawn for. Default prompts the user for input from the command line.
`type`	Determines the style of graph. type="boxes" draws boxplot style (default), type="lines" draws overlain lines increasing in thickness
`clr`	Determines the set of colours to use for the boxes. Default is greyscale.
`scl`	Specifies a proportional scaling factor to increase (scl > 1) or decrease (scl < 1) the default width of lines or boxes. Default = 1.
`xspc`	Sets the amount of blank space either side of the first and last (on the x-axis) graphic object.
`prn`	If prn=TRUE the values for the defined probability densities (probs) are returned to the command window. Default is prn=FALSE with no such output.
`leg`	Determines whether a legend is to be drawn (leg=TRUE) or not (default leg=FALSE). Note, currently only supported for type="lines".