function lsr2=lsfct2(xx)
t = [10 11 12 13 14 15 16] ;
amount = [ 101 95 90 86.5 82 79 78.2];
lsr2 = 0;
for i=1:7
   lsr2 = lsr2 + (amount(i)-sol2(xx(1),xx(2),t(i)))^2;
end