/usr/lib/pd/extra/ is in pd-iemtab 1.20-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/pd/extra/iem_tab/
/usr/lib/pd/extra/iem_tab/iem_tab.pd_linux
/usr/lib/pd/extra/iem_tab/tab_abs-help.pd
/usr/lib/pd/extra/iem_tab/tab_add-help.pd
/usr/lib/pd/extra/iem_tab/tab_add_scalar-help.pd
/usr/lib/pd/extra/iem_tab/tab_carth2polar-help.pd
/usr/lib/pd/extra/iem_tab/tab_complex_inv-help.pd
/usr/lib/pd/extra/iem_tab/tab_complex_mul-help.pd
/usr/lib/pd/extra/iem_tab/tab_const-help.pd
/usr/lib/pd/extra/iem_tab/tab_conv-help.pd
/usr/lib/pd/extra/iem_tab/tab_copy-help.pd
/usr/lib/pd/extra/iem_tab/tab_counter-help.pd
/usr/lib/pd/extra/iem_tab/tab_cross_corr-help.pd
/usr/lib/pd/extra/iem_tab/tab_dbtopow-help.pd
/usr/lib/pd/extra/iem_tab/tab_dbtorms-help.pd
/usr/lib/pd/extra/iem_tab/tab_div-help.pd
/usr/lib/pd/extra/iem_tab/tab_eq-help.pd
/usr/lib/pd/extra/iem_tab/tab_eq_scalar-help.pd
/usr/lib/pd/extra/iem_tab/tab_fft-help.pd
/usr/lib/pd/extra/iem_tab/tab_find_exact_peaks-help.pd
/usr/lib/pd/extra/iem_tab/tab_find_peaks-help.pd
/usr/lib/pd/extra/iem_tab/tab_ge-help.pd
/usr/lib/pd/extra/iem_tab/tab_ge_scalar-help.pd
/usr/lib/pd/extra/iem_tab/tab_get_size-help.pd
/usr/lib/pd/extra/iem_tab/tab_gt-help.pd
/usr/lib/pd/extra/iem_tab/tab_gt_scalar-help.pd
/usr/lib/pd/extra/iem_tab/tab_ifft-help.pd
/usr/lib/pd/extra/iem_tab/tab_le-help.pd
/usr/lib/pd/extra/iem_tab/tab_le_scalar-help.pd
/usr/lib/pd/extra/iem_tab/tab_lt-help.pd
/usr/lib/pd/extra/iem_tab/tab_lt_scalar-help.pd
/usr/lib/pd/extra/iem_tab/tab_max_index-help.pd
/usr/lib/pd/extra/iem_tab/tab_min_index-help.pd
/usr/lib/pd/extra/iem_tab/tab_min_max-help.pd
/usr/lib/pd/extra/iem_tab/tab_mul-help.pd
/usr/lib/pd/extra/iem_tab/tab_mul_scalar-help.pd
/usr/lib/pd/extra/iem_tab/tab_ne-help.pd
/usr/lib/pd/extra/iem_tab/tab_ne_scalar-help.pd
/usr/lib/pd/extra/iem_tab/tab_powtodb-help.pd
/usr/lib/pd/extra/iem_tab/tab_reverse-help.pd
/usr/lib/pd/extra/iem_tab/tab_rfft-help.pd
/usr/lib/pd/extra/iem_tab/tab_rifft-help.pd
/usr/lib/pd/extra/iem_tab/tab_rmstodb-help.pd
/usr/lib/pd/extra/iem_tab/tab_sqrt-help.pd
/usr/lib/pd/extra/iem_tab/tab_sub-help.pd
/usr/lib/pd/extra/iem_tab/tab_sum-help.pd