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Back= row_3 + vertical_space/7; cv_in_1a = [left_col, row_1, 0]; fm_in = [first_col, fourth_row, 0]; pwm_cv_lvl = [width_mm - h_margin - working_width/8, row_3, 0]; cv_in_2b = [right_col, row_2, 0]; fm_lvl = [h_margin+working_width/8, row_3, 0]; pwm_duty = [input_column, bottom_row, 0]; c_tune = [width_mm/2 + h_margin, top_row, 0]; f_tune = [width_mm/2 + h_margin, top_row, 0]; left_rib_x = thickness + 6.