E.display(xaxis, alpha = .8)

        :Arguments: xaxis, alpha

        Plots the CI region on the current figure, with respect to
        xaxis, at opacity alpha.

        :Note: The fill color of the envelope will be self.mass
            on the grayscale.

def display(self, xaxis, alpha, new=True):
        """
        E.display(xaxis, alpha = .8)

        :Arguments: xaxis, alpha

        Plots the CI region on the current figure, with respect to
        xaxis, at opacity alpha.

        :Note: The fill color of the envelope will be self.mass
            on the grayscale.
        """
        if new:
            figure()
        if self.ndim == 1:
            if self.mass > 0.:
                x = concatenate((xaxis, xaxis[::-1]))
                y = concatenate((self.lo, self.hi[::-1]))
                fill(
                    x,
                    y,
                    facecolor='%f' % self.mass,
                    alpha=alpha,
                    label=(
                        'centered CI ' + str(
                            self.mass)))
            else:
                pyplot(
                    xaxis,
                    self.value,
                    'k-',
                    alpha=alpha,
                    label=(
                        'median'))
        else:
            if self.mass > 0.:
                subplot(1, 2, 1)
                contourf(xaxis[0], xaxis[1], self.lo, cmap=cm.bone)
                colorbar()
                subplot(1, 2, 2)
                contourf(xaxis[0], xaxis[1], self.hi, cmap=cm.bone)
                colorbar()
            else:
                contourf(xaxis[0], xaxis[1], self.value, cmap=cm.bone)
                colorbar()