figure
set(gcf, 'Color', 'white', 'PaperUnit', 'centimeters', 'PaperSize', [12 8], ... 
    'PaperPosition', [0 0 12 8])
for i = 1:6
    subplot(2, 3, i)
    plot(0,0)
    xlim([-1, 1])
    ylim([-1, 1])
    set(gca, 'XTick', [-1 0 1], 'YTick', [-1 0 1], 'TickDir', 'out', ...
        'XTickLabels', [], 'YTickLabels', [], ...
        'XGrid', 'on', 'YGrid', 'on', 'GridLineStyle', ':', 'Linewidth', 1.0, ...
        'TickLength', [0.035 0.015])
    
    text(-0.15, 0, num2str(i), 'fontsize', 14)
    text(-1.5, 1.3, strcat(char(64 + i), ')'), 'fontsize', 10)
end
saveas(gcf, 'regular_subplot', 'pdf')