'*linthresh*:
The range within which the plot is linear (to
avoid having the plot go to infinity around zero).
*linscale*:
This allows the linear range (-*linthresh* to *linthresh*)
to be stretched relative to the logarithmic range.  Its
value is the number of decades to use for each half of the
linear range.  For example, when *linscale* == 1.0 (the
default), the space used for the positive and negative
halves of the linear range will be equal to one decade in
the logarithmic range. Defaults to 1.'

def __init__(self, linthresh, linscale=1.0, vmin=None, vmax=None, clip=False):

    Normalize.__init__(self, vmin, vmax, clip)
    self.linthresh = float(linthresh)
    self._linscale_adj = (linscale / (1.0 - (np.e ** (-1))))
    if ((vmin is not None) and (vmax is not None)):
        self._transform_vmin_vmax()
