atp_axis
fg_extract_sensor_data(const int8_t *sensor_data, u_int num, atp_axis axis,
fg_match_strokes_against_pspans(struct atp_softc *sc, atp_axis axis,
atp_axis repeat_axis; /* axis with multi-pspans */
static void fg_extract_sensor_data(const int8_t *, u_int, atp_axis,
atp_axis, fg_pspan *, u_int, u_int);