The followers growth graph consists of two parts: total and new.
The total cumulative part of graph (orange line) shows how the account is growing. If the growth is smooth, it is most likely organic growth. If the account suddenly gained subscribers, and then began to lose quickly, this is a giveaway.
The new part of graph is the sum of new followers and unfolllowers for this day. We use this daily growth (bars) to see how our activities worked. For example, we know that on October 24rd we launched a new category in Stories. In the graph, we will see its impact on followers growth. Blue bars are growth and red bars are falling.
There are folllowers gain for this date range in upper right corner.