Begin error bar calculation

	modified:   exp2/report/report2.tex
Merge branch 'master' of github.com:HappyEmu/physics-reports

Conflicts:
	exp2/report/report2.tex

	modified:   exp2/data/data.xlsx
	deleted:    exp2/report/img/Resonance Frequencies.pdf
	new file:   exp2/report/img/ResonanceFrequencies.pdf
	modified:   exp2/report/report2.tex