Yes, mining reward for hashrate (it's in the legend 
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I'm just saying that there shouldn't be any distortions like that, chart should be smooth.
)I'm just saying that there shouldn't be any distortions like that, chart should be smooth.
If nethash drops in half then the diff will sooner or later drop in half as well, this is normal.
Same for increase. Thats why I prefer to look at profitability in 24h intervals.