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2mm - but adjust to shift left and right columns toward the center center_adjust = 2.5; //mm first_col = 10.1+center_adjust; //mm second_col = width_mm/2; //mm third_col = 60.7-center_adjust; //mm cv_in = [first_col, fifth_row, 0]; //left_rib_x = thickness + 6 + tolerance; rotate_vector_cos = 0.94; // 'x' of 20 degree rotation rotate_vector_sin = 0.34; // 'y' of rotation left_edge = -rotate_vector_sin * rail_depth; right_edge = height - v_margin; working_increment = working_height / (8+tolerance/3); // generally-useful spacing amount for vertical columns of stuff working_height = height - 25; // build up seven rows; middle one unused row_2 = row_1 + v_margin + 12; row_2 = row_1 + vertical_space/7; row_3 = row_2 + vertical_space/7; row_3 = row_2 + vertical_space/7; row_6 = row_5 + vertical_space/7; row_5 = row_4 + vertical_space/7; row_7 = row_6 + vertical_space/7; row_4 = row_3 + vertical_space/7; row_7 = row_6 + vertical_space/7; row_6 = row_5 + vertical_space/7.

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