Text Boxes on MATLAB not showing up

The text boxes are not showing up for my plot, I am not getting an error message either. Let me know what is wrong in this code

clear, clc, close all
farsemi = zeros(1,1);
thirdsemi=zeros(1,1);

CH4_3 =[3.03,2.75,2.58,2.44,2.30,2.27,2.19,2.11,2.03,1.97,1.91,1.83,1.79,1.74,1.71,1.65,1.62,1.5,960e-3,726e-3,730e-3,775e-3,739e-3,787e-3];
Step_3 =[3,6,9,12,15,18,21,24,27,30,33,36,39,42,45,48,51,81,111,141,171,201,231,261];
plot(Step_3,CH4_3,'-*','LineWidth',2)
index = (CH4_3 >= 1.5);
plot(Step_3,CH4_3,'b-*','LineWidth',2);
hold on
plot(Step_3(index), CH4_3(index), 'r-*','LineWidth',2);

semifar = CH4_3(end);
far=CH4_3(CH4_3>1.4 & CH4_3<1.6);
third=CH4_3(end-1);

farsemi = (far-semifar)./semifar;
thirdsemi = (third-semifar)./third;

dim1=[0.15,0.2,1,1];
dim2=[0.8,0.2,1,1];

str1=sprintf('%.2f',farsemi); 
annotation('textbox',dim1,'String',str1,'FitBoxToText','on','EdgeColor','b');
str2=sprintf('%.2f',thirdsemi); 
annotation('textbox',dim2,'String',str2,'FitBoxToText','on','EdgeColor','r');

Answer 1

[Star Strider]

The annotation object positioning convention remains something of a mystery to me.

So I have no idea why this works, it just does:

dim1=[0.15,0.2,0.1,0.1];
dim2=[0.8,0.2,0.1,0.1];

Experiment to get the result you want!

[Hans123]

Star Strider, you are a blessing to all of us in this forum.

Thanks again!

[Star Strider]

As always, my pleasure!

I very much appreciate your compliment!