Hodlers is a Volume Indicator that signals the degree of accumulation or speculation present in the market.
The faded background histogram shows the Gross Volume.
The solid front histogram shows the Hodl Volume.
The gap betwen the Hodl Volume and the Gross Volume represents the Speculation that took place within that period of time.
Hodlers might be interested to check when Market Makers are Hodling and when are Selling their Bags.