figure(202120); clf; hold on
set(gcf, 'WindowState', 'maximized');

x = 225:10:285;
shift = 0.5;
x = [x;x-shift;x+shift;x;x];

hErr  = gobjects(1,4);   % Errorbars -> für Legende
hLine = gobjects(1,4);   % Linien durch Mittelwerte (nicht in Legende)

for k = 1:4
    BER = load("C:\Users\magf\Desktop\Desktop\Projekte\FSO\Data\BER_PAM_4_Optimal" + string(k) + ".mat");
    BER_all = BER.BER_num_signal_sweep_matrix;
    BER_traces = BER_all((k-1)*7+1:k*7,:);

    BER_min = zeros(1,7); BER_avg = zeros(1,7); BER_max = zeros(1,7);
    for l = 1:7
        BER_min(l) = min(BER_traces(l,:));
        BER_avg(l) = mean(BER_traces(l,:));
        BER_max(l) = max(BER_traces(l,:));
    end

    % Log-sicherer Floor (falls min=0)
    yFloor = 1e-12;
    BER_min(BER_min <= 0 | isnan(BER_min) | isinf(BER_min)) = yFloor;
    BER_max(BER_max <= 0 | isnan(BER_max) | isinf(BER_max)) = yFloor;
    BER_max = max(BER_max, BER_min);

    % Errorbar-Parameter (asymmetrisch)
    y    = BER_avg;
    yneg = BER_avg - BER_min;
    ypos = BER_max - BER_avg;

    % Errorbars (Punkt + Intervall)
    hErr(k) = errorbar(x(k,:), y, yneg, ypos, 'o', ...
        'LineWidth', 2.75, 'MarkerSize', 8, 'CapSize', 10);

    % Gestrichelte Linie durch die Mittelwerte (gleiche Farbe)
    hLine(k) = plot(x(k,:), y, '--o', ...
        'LineWidth', 2.75, ...
        'MarkerSize', 8, ...
        'Color', hErr(k).Color);
end

% Paper-Kurve
old_BER = 10.^([-1.6, -1.85, -2.2, -2.45, -2.3, -2, -1.4]);
hPaper = plot(x(k+1,:), old_BER, '-o', 'LineWidth', 2.75, 'MarkerSize', 8);

% FEC-Linien
yline(2e-2,  ':k', 'LineWidth',1.2);
yline(3.8e-3,':b', 'LineWidth',1.2);
yline(4.85e-3,':g','LineWidth',1.2);
yline(2.2e-4,':r', 'LineWidth',1.2);

% FEC Labels (wie bei dir, FontSize = 16)
text(221,  2.3e-2,'o-FEC',        'Color','k','FontSize',22,'Interpreter','latex')
text(221,  3e-3,'HD-FEC',         'Color','b','FontSize',22,'Interpreter','latex')
text(221,  6e-3,'KP4+Hamming',  'Color','g','FontSize',22,'Interpreter','latex')
text(221,  2.5e-4,'KP4',          'Color','r','FontSize',22,'Interpreter','latex')

% Achsen
set(gca,'YScale','log'); grid minor
ylim([1e-5 5e-1])

% ---- Schriftgrößen: Achsen + Legende = 22 ----
ax = gca;
ax.FontSize = 22;
ax.LabelFontSizeMultiplier = 1;

xlabel('Laser Bias Current [mA]', 'Interpreter','latex', 'FontSize', 22)
ylabel('BER', 'Interpreter','latex', 'FontSize', 22)

% Legende: Errorbar-Handles verwenden (Marker + vertikale Linie)
lgd = legend([hErr(1) hErr(2) hErr(3) hErr(4) hPaper], ...
       {'FFE','FFE+PF+MLSE','DB','ML-MLSE','BER Paper'}, ...
       'Interpreter','latex','Location','southwest');
lgd.FontSize = 22;

% ---- Figure "Presentation"-Style ----
set(gcf, 'Color', 'w');
set(gcf, 'Units', 'pixels', 'Position', [100 100 1400 900]);
set(gcf, 'Renderer', 'painters');

hold off