Recently I've noticed some videos have a graph above the progress bar. What data does this graph represent?

Recently I've noticed some videos have a graph above the progress bar. What data does this graph represent?

https://i.imgur.com/vw1Qbog.png

original: https://i.imgur.com/vw1Qbog.png

nsfw videos: Pornhub

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Officer Bigtits

Officer Bigtits

LisaAnn

Beaten to Death [M/F]

Beaten to Death [M/F]

guro

Cutie

Cutie

downblouse, nsfw

Trying This Again (F)

Trying This Again (F)

Innie

[NSFW] grizz x nom nom

[NSFW] grizz x nom nom

BearStack

Black

Black

SophiaAdams

Abella & AJ

Abella & AJ

abelladanger

The pose does it for me

The pose does it for me

JizzedToThis

What do you think of a size comparison?

What do you think of a size comparison?

MassiveCock, sizecomparison, cock

Mega Booty Album

Mega Booty Album

whiteass

Fucking hell...

Fucking hell...

SophiaAdams

KiK NoemieKins babes i got videos pics sexting

KiK NoemieKins babes i got videos pics sexting

gonewild

Blue

Blue

SophiaAdams

Gal Gadot (Wonder Woman, 2017)

Gal Gadot (Wonder Woman, 2017)

GirlswithGlasses

School swimsuit, Nipple lock

School swimsuit, Nipple lock

hentiny