- call:
- Object of class - "call"~~
 
    
- model:
- Object of class - "character"~~
 
    
- data:
- Object of class - "data.frame"~~
 
    
- fit:
- Object of class - "list"~~
 
    
- title:
- Object of class - "character"~~
 
    
- description:
- Object of class - "character"~~
 
  
Slot fit is a list with components:
    
- estimate
- the point at which the maximum value of the log liklihood 
      function is obtained. 
    
- minimum
- the value of the estimated maximum, i.e. the value of the
      log liklihood function. 
    
- code
- an integer indicating why the optimization process terminated. 
    
- gradient
- the gradient at the estimated maximum. 
  
The above description of slot fit is taken from the
  documentation for tFit, nFit and
  stableFit. TODO: needs checking and also is it the same for
  other distribution fitting functions.