MATLAB: Combine 2 shaded boundaries

shading between limits

I can create the shaded boundary (y1 and Y2) individually but I have issues merging the two codes together. The data file is attached and the code is shown below. Thank you.
data=load('Jun15_VelocityUV.txt');
b= data(:,1);
y=b(104:127,:);
% Input x-axis
x = linspace(1,24,24);
xi=1:0.01:24;
yi=interp1(x,y,xi,'spline');
h=plot(xi,yi)
% Define Limit
y1=0.6;
y2 = -0.6;
hold on
%area(xi, min(yi, y2), y2,'EdgeColor', 'none', 'FaceColor', [.7 .7 .7])
hold on
area(xi, max(yi, y1), y1, 'EdgeColor', 'none', 'FaceColor', [.7 .7 .7])
hold off

Best Answer

A few tweaks and it works:
data=load('Jun15_VelocityUV.txt');
b= data(:,1);
y=b(104:127,:);
% Input x-axis
x = linspace(1,24,24);
xi=1:0.01:24;
yi=interp1(x,y,xi,'spline');
% Define Limit
y1=0.6;
y1v = y1*ones(size(xi));
y2 = -0.6;
y2v = y2*ones(size(xi));
figure(1)
h=plot(xi,yi);
hold on
patch([xi(yi <= y2), fliplr(xi(yi <= y2))], [y2v(yi <= y2), fliplr(yi(yi <= y2))], [.7 .7 .7], 'EdgeColor', 'none')
patch([xi(yi >= y1), fliplr(xi(yi >= y1))], [y1v(yi >= y1), fliplr(yi(yi >= y1))], [.7 .7 .7], 'EdgeColor', 'none')
plot(xi, y1v, '-k',    xi, y2v, '-k')
hold off
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