x-axis on plots produced with `ggs_ppsd` have incorrect label

[adcascone]

Hello,

I noticed that plots produced with ggs_ppsd have x-axis labels that are "Posterior predictive mean" instead of "Posterior predictive standard deviation" as shown in Figure 7 of the Journal of Statistical Software paper that accompanies this package. Shown is the output of the following code:

data(linear)
ggs_ppsd(ggs(s.y.rep), outcome=y) #code from reference manual pg. 26

I believe this might be a typo in the ggs_ppsd code (i.e., line 40 here). Is that the case?

Note: I am using ggmcmc version 1.5.1.1

Thank you for your time!
Arianna C.