The program calls graphic, which is not visible in modern computers.

The program can generate data files, e.g. with night-length as a function of date.

The program is controlled by inputting numbers (options given on a menu). Exit by inputting 0!

When clicking, the web-browser may just download it somewhere on your computer.

The algorithm is described in: Lindgren D 1993. Accelerated adaptation of trees at tree limits by selective breeding. In: Alden J, Mastrantonio, J L & Odum S (editors) "Forest development in cold climates". Plenum Press, New York. pp 299-320. ISBN 0-306-44480-1.

It has been said that a site in Sweden (as well as in many other places) is best described by light climate and heat climate. This program gives light climate, heat climate is found in TEMPPRED.

The program was written 1991. It has never been well-tested.