The background functions

      You can take a look at the definitions of the background functions with the command:

 
• []tv$>$ fit function background definition polynom
    $BG(x)=\; \sum$_n=0^N B_n ⋅(x-x₀)ⁿ

  B$$_n :

  background coefficient (parameter)

  x$$₀ :

  offset for numerical optimization during fit

• []tv$>$ fit function background definition exponential
    $BG(x)=\; \sum$_n=0^N B_n ⋅(x-x₀)ⁿ + FAC ⋅ exp(-(x-x₀)⋅EXP)

  B$$_n :

  background coefficient (parameter)

  x$$₀ :

  offset for numerical optimization during the fit

  FAC:

  factor of exponential term

  EXP:

  scaling of exponential term