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BackBuild up seven rows; middle one unused row_2 = row_1 + vertical_space/7; row_4 = row_3 + vertical_space/7; cv_in_1a = [left_col, row_7, 0]; cv_in_1b = [right_col, row_6, 0]; cv_1b_atten = [right_col, row_2, 0]; f_tune = [width_mm/2 - h_margin, top_row, 0]; left_rib_x = hole_dist_side + thickness; col_left = h_margin; col_right = width_mm - h_margin; out_row_1 = v_margin+12; // draw a horizontal wall (across the panel module v_wall(h, w) { // replace the