You have selected the Diamond Annual membership level.
This is the annual discount for this membership, which gets you twelve months for the price of ten and also gets you a free, signed copy of Tim Knight's new book, the Joy of Charting. The Diamond level of membership is the most complete of any of the offerings on Slope. In addition to all the benefits of Bronze, Silver, and Gold Members, you have unrestricted access to all of the features. Some highlights include:
As new features get added to the site, they will always be added to this, the highest of levels.