def METHOD_NAME(self):
    """
    Try to load a velocity model.
    """
    # Read the velocity model file.
    filename = self.input_filename
    if self.debug:
        print("filename =", filename)
    self.v_mod = VelocityModel.read_velocity_file(filename)
    if self.v_mod is None:
        raise IOError("Velocity model file not found: " + filename)
    # If model was read:
    if self.debug:
        print("Done reading velocity model.")
        print("Radius of model " + self.v_mod.model_name + " is " +
              str(self.v_mod.radius_of_planet))
    # if self.debug:
    #    print("velocity mode: " + self.v_mod)
    return self.v_mod