Dear Isaac,
the + symbol you see either at the top or bottom of the boxplot represents one or more outliers.
For details see here:
https://uk.mathworks.com/help/stats/boxplot.html

Hope it helps,
Ludovica
—
Ludovica Griffanti, PhD
Analysis Postdoctoral Research Assistant
Oxford Centre for Functional MRI of the Brain (FMRIB)
Nuffield Department of Clinical Neurosciences, University of Oxford
John Radcliffe Hospital
Oxford, OX3 9DU, UK
email: [log in to unmask]

On 14 Mar 2017, at 5:20 am, SUBSCRIBE FSL Isaac <[log in to unmask]> wrote:

Dear Experts,

I have a simple question. I have recently run FSLNets and got to the stage of creating boxplots of significant components. On some of the images I have generated I see a red addition symbol -- Could you please let me know what this symbol means. Does it indicate significance?

Thank you in advance,
Isaac