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import numpy as np

class rgb_interpolator :

   """a class to generate a 2 rgb colors interpolator """

   @property

   def color0(self) :

      """the 0 color"""

      return self._color0

   @property

   def color1(self) :

      """the 1 color"""

      return self._color1

   def __init__(self,rgb0,rgb1) :

      self._color0=np.array(rgb0,dtype=float)

      self._color1=np.array(rgb1,dtype=float)

   def __call__(self,x) :

      if x <0 or x>1 :

         raise Exception('x must be in [0,1]')

      return self._color0*(1-x)+self._color1*x

class ImshowXT :

   """ class to handle an improved version of plt.imshow """

   def __init__(self,matr,x_values,y_values,**kwargs) :