geom_signific_strict.md
In ggsignif: Significance Brackets for 'ggplot2'

the plotting works - strict test

Code
  pb$data
Output
  [[1]]
      fill     x y PANEL group flipped_aes ymin ymax xmin xmax colour size
  1 grey80 0.875 3     1     1       FALSE    0    3 0.75 1.00     NA  0.5
  2 grey20 1.125 5     1     3       FALSE    0    5 1.00 1.25     NA  0.5
  3 grey80 1.875 7     1     2       FALSE    0    7 1.75 2.00     NA  0.5
  4 grey20 2.125 8     1     4       FALSE    0    8 2.00 2.25     NA  0.5
    linetype alpha
  1        1    NA
  2        1    NA
  3        1    NA
  4        1    NA

  [[2]]
        x  xend   y yend annotation PANEL group shape colour textsize angle hjust
  1 0.875 1.125 5.8  5.8        ***     1     1    19  black     3.88     0   0.5
  2 1.875 2.125 8.5  8.5         NS     1     2    19  black     3.88     0   0.5
    vjust alpha family fontface lineheight linetype size
  1     0    NA               1        1.2        1  0.5
  2     0    NA               1        1.2        1  0.5

  [[3]]
    x xend     y  yend annotation   group flipped_aes PANEL shape colour textsize
  1 1    1 9.575 9.575        *** S1-S2-1       FALSE     1    19  black     3.88
  2 1    2 9.575 9.575        *** S1-S2-1       FALSE     1    19  black     3.88
  3 2    2 9.575 9.575        *** S1-S2-1       FALSE     1    19  black     3.88
    angle hjust vjust alpha family fontface lineheight linetype size
  1     0   0.5     0    NA               1        1.2        1  0.5
  2     0   0.5     0    NA               1        1.2        1  0.5
  3     0   0.5     0    NA               1        1.2        1  0.5