def get_color(self):
        """ Return the array of rgba colors (same order as lStruct) """
        col = np.full((self._dStruct['nObj'],4), np.nan)
        ii = 0
        for k in self._dStruct['lorder']:
            k0, k1 = k.split('_')
            col[ii,:] = self._dStruct['dObj'][k0][k1].get_color()
            ii += 1
        return col
Return the array of rgba colors (same order as lStruct)