
to derive formula with spreadsheet

FSR	Fg		FSR	Fg
1500	2000		1,5	2000
2000	1500		2	1500
3000	1000		3	1000
4000	500		4	500
5000	400		5	400
7000	250		7	250
10000	190		10	190
15000	100		15	100
20000	80		20	80
30000	60		30	60
40000	45		40	45
50000	35		50	35
60000	30		60	30
70000	27		70	27
80000	25		80	25
