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On the blog we shared two plots, the top is the frequency response graph (like what you may be used to seeing for headphones) and the bottom is a polar plot.
The frequency response graph (above) shows the microphone's sensitivity at different frequencies for a specific angle. Here 0 degrees indicate on-axis, i.e. when you directly speak into it. You want the on-axis response to be flattish with no major peaks or dips till 10kHz so that all of the vocal range is captured without coloration. 135 degrees is the off-axis response (see below image as an example), this is sort of around and away from the mic, like where your keyboard is likely to be. 180 degrees is directly behind the mic, most likely this is where your monitor will be be if you are facing it. In the first plot you will see the the off axis sensitivity is between 20 to 30dB less than the on axis response in the midrange. What this means is sound arriving from around the mic will be up to 30dB quieter in the region where where our ears are most sensitive providing a good noise suppression of extraneous sounds.
The polar plot (below) Is a different way of plotting the frequency response to show the mic pick up pattern to show how different frequency ranges are picked up around the mic. The concentric circles indicate the sensitivity (the outer most indicate most sensitive and inner most least sensitivity). Here you see that the frequencies up to 10kHz re most sensitive when directly speaking into the mic (0 degrees) and they start falling off about 60 degrees to to either side and are least sensitive around 135 degrees.