MY92-96
=======
Multiplier = 2.75
Constant   = -486

MY97-00
=======
M = 3.45
C = -601

GM 3Bar
=======
M = 3.11
C = 6

Apexi 3Bar
==========
M = 3.44
C = -400

Newage (1.5)
============
M = 3.35
C = -550

Newage (1.8)
============
M = 3.44
C = -420