How to distinguish between multiple plots using yyaxis?

Hi all,

I am trying to create multiple plots from various data vectors in a live script, the code looks as follows:

yyaxis left  %PLOT1 (1)
plot(x,data_1a)
ylabel('Volumenstrom [kg/h]');

yyaxis right   %PLOT1 (2)
plot(x,data1b);
ylabel('Besucheranzahl [-]');

xlabel('Uhrzeit [hh:mm:ss]');
grid on;

yyaxis left; %PLOT2 (3)
plot(x,data2a);
ylabel('Volumenstrom [m³/h]');

yyaxis right;   %PLOT2 (4)
plot(x,data2b);
ylabel('Besucheranzahl [-]');

xlabel('Uhrzeit [hh:mm:ss]');
grid on;

By using yyaxis I am plotting one data type on the left yaxis and the other on the right. However, Matlab creates a plot for each pair of yyaxis left and yyaxis right-calls. According to the numerators in brackets in the code above, the following plots are created:

plot (1)-(2), plot (2)-(3), plot (3)-(4)

Instead of only plot (1)-(2) and plot (3)-(4). How can I make it so that Matlab only creates these two plots i wish to obtain? I know there is work-around potential here but I would like to keep using the yyaxis command. I reckon there is some kind of "end plot"-command but i did not find anything yet.

Greetings!