Comparing the following sounds, you can notice that any syllable pronounced with the same tone has exactly the same pitch variation:

First Tone
an1 ni1 xin1
... try to repeat what you listen ...
Second Tone
bie2 ji2 xi2
Third Tone
ben3 bi3 fei3
Fourth Tone
du4 han4 se4
Neutral Tone
ba5 de5 ne5

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