How can I read CSV file and plot without removing header?

I want to read CSV file without removing header. The first row is the header. I tried with readtable but then I can not able to read the column as well. It is showing Invalid subscript error. I've attached the csv file and code in here.

A= dlmread('v1.csv'); %data read
freq= A(:,1); % it contains the frequency column
S11= A(:,2); % it contains S11 which is 2nd column
S21= A(:,3); % it contains S21 which is 3rd column
figure;
plot(freq,S11,'-','LineWidth',1.5,'color',[30,129,176]/255); 
hold on; 
plot(freq,S21,'-','LineWidth',1.5,'color',[215,74,31]/255); 

Answer 1

[Voss]

A = readtable('v1.csv')

Warning: Column headers from the file were modified to make them valid MATLAB identifiers before creating variable names for the table. The original column headers are saved in the VariableDescriptions property.
Set 'VariableNamingRule' to 'preserve' to use the original column headers as table variable names.

A = 6691×3 table
    Freq_GHz_    dB_S_P1_P1____    dB_S_P2_P1____
    _________    ______________    ______________

       0.1          -26.042          -0.075703   
      0.11          -25.243          -0.081879   
      0.12          -24.517          -0.088211   
      0.13          -23.851           -0.09466   
      0.14          -23.237           -0.10119   
      0.15          -22.668           -0.10779   
      0.16          -22.138           -0.11444   
      0.17          -21.641           -0.12113   
      0.18          -21.174           -0.12785   
      0.19          -20.735           -0.13461   
       0.2          -20.319            -0.1414   
      0.21          -19.925           -0.14824   
      0.22          -19.551           -0.15511   
      0.23          -19.194           -0.16204   
      0.24          -18.855           -0.16901   
      0.25           -18.53           -0.17604   

figure;
plot(A{:,1},A{:,2},'-','LineWidth',1.5,'color',[30,129,176]/255); 
hold on; 
plot(A{:,1},A{:,3},'-','LineWidth',1.5,'color',[215,74,31]/255); 

[Md. Imtiaz Kamrul]

Thank you so much. It works

[Voss]

You're welcome!