The Linest Function has severe errors when curve fitting my data as follows:

X Y
2499.89 -0.240420
4499.83 -0.432740
6499.77 -0.625070
8999.69 -0.865580
11499.83 -1.106090
13499.91 -1.298610
15999.74 -1.539220
18499.93 -1.779800
20500.05 -1.972495
21999.93 -2.116850
2499.89 -0.240400
4499.83 -0.432740
6499.77 -0.625070
8999.69 -0.865535
11499.83 -1.106125
13499.91 -1.298610
15999.74 -1.539235
18499.93 -1.779850
20500.05 -1.972410
21999.93 -2.116830
2499.89 -0.240430
4499.83 -0.432770
6499.77 -0.625150
8999.69 -0.865625
11499.83 -1.106175
13499.91 -1.298680
15999.74 -1.539240
18499.93 -1.779895
20500.05 -1.972440
21999.93 -2.116840

D C B
A
4.384643E-17 -4.849642E-12 -9.613158E-05 -7.173873E-05

If you change the first 'Y' value to -0.240419 (the real value), the Linest
Equation blows up and is wrong, (Value of 'D' is zero). The results are
below:
D C B A
0 -4.83784E-12 -9.61317E-05 8.03804E-05

Is there any fix by Microsoft in the works or is there something I can do to
ensure data sent to the customer is correct?
--
Jim
National Research Council of Canada