how can i change the linetype for plotted variables in ggradar?

[SusiWo]

Hi,

I would like to assign different linetypes for plotting two different sets of variables in ggradar. I tried something like
group.linetype = c("longdash", "solid")
or
group.line.type = c("longdash", "solid")
or
group.line.linetype = c("longdash", "solid")

None of the options work for me. What would be the right synthax to change that?

And another issue is that ggradar seems to order the variables automatically in an alphabetical order when plotting and putting together the legend. Can I change that default setting and keep the order of variables according to my dataset?

Many thanks for your great help!

Cheers

Susi