new file:   16.500 Photoeffekt/500.ggb
	modified:   21.351 Fourier/Messwerte.ods
	modified:   21.351 Fourier/pics/dreieck.pdf
	modified:   21.351 Fourier/pics/rechteck.pdf
	modified:   21.351 Fourier/pics/saegezahn.pdf
	modified:   21.351 Fourier/protokoll.tex