MATLAB: How to draw vertical lines on the plot

ecghrvlineplotpsdpwelchspectral analysis

Hello, I'm doing HRV spectral analysis and I want draw vertical lines around freq bands on my plot. It'd be great if each area could be in different colour. If anyone could give me any tip, shall be very grateful 😉
I need to add this to this plot:
%Calculate PSD
    [PSD,F] = pwelch(odstepRR,128,64,[],fs); %uses a hamming window
      VLF = [0.0033 0.04];
      LF = [0.04 0.15];
      HF = [0.15 0.4];
      % find the indexes corresponding to the VLF, LF, and HF bands
      iVLF= (F>=VLF(1)) & (F<=VLF(2));
      iLF = (F>=LF(1)) & (F<=LF(2));
      iHF = (F>=HF(1)) & (F<=HF(2));
      % calculate areas, within the freq bands (ms^2)
      aVLF=trapz(F(iVLF),PSD(iVLF));
      set(handles.vlf, 'string', num2str(aVLF));
      aLF=trapz(F(iLF),PSD(iLF));
      set(handles.lf, 'string', num2str(LF));
      aHF=trapz(F(iHF),PSD(iHF));
      set(handles.hf, 'string', num2str(aHF));
      aTotal=aVLF+aLF+aHF;
      set(handles.tp, 'string', num2str(aTotal));
      %calculate LF/HF ratio
      lfhf =aLF/aHF;
axes(handles.axes5);
set(handles.text45, 'visible', 'on')
set(handles.axes5, 'visible', 'on')
%plot area under PSD curve
area(F(:),PSD(:),'FaceColor',[.6 .6 .6]);        
grid on;

Best Answer

line([X X], [LowY HighY])
for example,
line([5 5], [0.1 17])
to draw a line from (5,0.1) to (5,17)
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