Match the CTFS magnitude graphs to the time functions.
1. Second-harmonic sine function. Non-zero impulses only at k=±2
2. One fundamental period of a square wave with an average value of 1. Harmonic function is a sinc function with a non-zero impulse at the fundamental k=1.
3. Two fundamental periods of a square wave with an average value of 1. Harmonic function is a sinc function with a zero impulse at the fundamental k=1 and a non-zero impulse at k=2.
4. Two fundamental periods of a triangle wave with an average value of 1. Harmonic function is a sinc squared function with a zero impulse at the fundamental k=1 and a non-zero impulse at k =2. The impulses are smaller than for a square wave because of the faster rate of decay of sinc squared compared with sinc.
5. Fourth-harmonic sine function. Non-zero impulses only at k =±4.
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