Shapes on timing diagram in phase encoding line

[Carenasage]

I would like to know 2 things . 1) what the different shapes mean for phase encoding. They're footballs, trapezoid, rectangles ? What do they mean as far as how the information is gathered and are placed in k space ? Why thinner and darker lines inside respective shapes?
2)different examples of timing diagrams that you can show what slice you are selecting , axial, sag, coronal .
Thank you