Table 2. Model variants proposed.

Model Variant №	α	ν	ζ	β(M)
1	0	Variable	Fixed to 1	β
2	0	Fixed to 1	Variable	β
3	1	Variable	Fixed to 1	β
4	1	Variable	Fixed to 1	β ⋅ μ(M)/μMAX
5	0	Variable	Fixed to 1	β ⋅ μ(M)/μMAX