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It is the curation rewards from the upvotes on your posts. Following you and upvoting your posts is good for business :)
check out this graph :

Cool thanks for the compliment, what does this one show? How did you do this you must be some kind of great programmer?

It's actually from a post by @abh12345 (here). It shows The % of curation rewarded Steem Power in relation to amount of Steem Power owned.