DBUS_TYPE_ARRAY, DBUS_TYPE_UINT32, &xs, &x_npoints,
DBUS_TYPE_ARRAY, DBUS_TYPE_DOUBLE, &_ys, &y_npoints,
DBUS_TYPE_DOUBLE, &preamp,
DBUS_TYPE_ARRAY, DBUS_TYPE_UINT32, &xs, &x_npoints,
DBUS_TYPE_ARRAY, DBUS_TYPE_DOUBLE, &_ys, &y_npoints,
DBUS_TYPE_DOUBLE, &preamp,