Plot multiple figures from the for loop in the same plot

Hi My data is in 5 sheets in a excel file. I want to plot data from each sheet in the same figure one over the another. But when I do this, it plots only the last sheet data. ??

%%Program to plot all data in one figure
clc
clear all
filename = 'data.xlsx';
sheetnames = { 'Sheet1','Sheet2','Sheet3','Sheet4','Sheet5' };
n = length(sheetnames);

for idx = 1:n
    a = xlsread(filename,sheetnames{idx}); 
    j=1:1:length(a);
    Time_hr(j) = a(:,1);
    Time_min(j) = a(:,2);
    Time(j) = Time_hr(j)+ Time_min(j)/60;
    freq(j)= a(:,3);
    for j=1:1:length(idx)    
    plot (Time(j),freq(j));
    end  
end

Someone help me out .

Answer 1

[KSSV]

figure ;
hold on
for idx = 1:n
    a = xlsread(filename,sheetnames{idx}); 
    j=1:1:length(a);
    Time_hr(j) = a(:,1);
    Time_min(j) = a(:,2);
    Time(j) = Time_hr(j)+ Time_min(j)/60;
    freq(j)= a(:,3);
    for j=1:1:length(idx)    
    plot (Time(j),freq(j));
    end  
end

you have to use hold on..to plot multiple curves on the same plot.

[Add]

Thank You.