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Matlab function rpmfreqmap doesn't show diagonal lines though there is variation in speed. I'm using vibration and tachometer data from dataset. I'm trying to perform order analysis as shown in Matlab example

However rpmfreqmap doesn't show any diagonal lines which i understand it's necessary for order analysis.I have attached my outputMy matlab output

I don't understand why it doesn't show any diagonal lines as shown in matlab example though there is change in speed.

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