Astigmatism

	2D CTF with no astigmatism (neither 2-fold nor 3-fold). Use the control panel to introduce astigmatism.
	The effect of 2-fold astigmatism. Click the left mouse button on the 2D CTF to change the direction where 1D CTF is calculated.
	The effect of 3-fold astigmatism. Click the left mouse button on the 2D CTF to change the direction where 1D CTF is calculated.

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