Character Tables of GL(2,q),SL(2,q), PGL(2,q) and PSL(2,q) 

These are finite groups over the field with q elements.
The notation is mostly (but not entirely) standard and selfexplanatory.
GL(2,q): 2x2 general linear group SL(2,q): 2x2 special linear group PGL(2,q): 2x2 projective general linear group, =GL(2,q)/center PSL(2,q): SL(2,q)/center
