__init__(self,
        x,
        y,
        bounds_behavior=['extrapolate', 'extrapolate'],
        slopes=[None, None],
        npoints=[2, 2],
        **interpargs)
     (Constructor)
  
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  x, y: 
sequences of data. Will be sorted by x value before use. 
bound_behavior: 
length-2 sequence specifying behavior below the lower and
above the upper boungs of the data, respectively. Each
element can be 'extrapolate', 'constant', or a numerical
value. 
npoints: 
Linear extrapolation uses the slope between x[0] and
x[npoints-1] or x[-npoints] and x[-1]. Note: this is not a
linear fit over that range. It Ignores points within the
interval 
interpargs: 
Extra keywords passed to scipy.interpolate.interp1d. 
  
   
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