hr(yPos) plot a horizontal line at yPos getting current axis values with default color gray, line width 1, and a solid line with no markers.
However, hr(yPos,varargin) plot a horizontal line at yPos getting current axis, while varargin takes any plot property as defined in built-in plot function in Matlab.
Shoaibur Rahman (2019). Horizontal line on a figure (https://www.mathworks.com/matlabcentral/fileexchange/48736-horizontal-line-on-a-figure), MATLAB Central File Exchange. Retrieved .
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