I am trying to understand the symmetry elements of space group number 194 (P$6_3$/mmc), which is hexagonal and has 24 symmetry operations.
In the table of symmetry operations it says that it has three glide planes, which I marked in the figure (see blue rectangles). However, more than three glide planes are represented in the figure, since there are more dashed, dashed-dotted and dotted lines than those lines which are represented in the rectangles. Why do more glide planes appear than those three on the table of symmetry operations?
(Images taken from International Tables of Crystallography)