'Flatten decrease data and get decrease text
:rtype (list, list, list): flat_decrease_x: x-values for the decreasing
trace, flat_decrease_y: y=values for the decreasing trace and
text_decrease: hovertext for the decreasing trace'

def get_decrease(self):

    flat_decrease_x = utils.flatten(self.decrease_x)
    flat_decrease_y = utils.flatten(self.decrease_y)
    text_decrease = (('Open', 'Open', 'High', 'Low', 'Close', 'Close', '') * len(self.decrease_x))
    return (flat_decrease_x, flat_decrease_y, text_decrease)
