Need help don't understand A Matlab file lab03plot.m is provided, which includes the image compression rate-distortion performances

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A Matlab file lab03plot.m is provided, which includes the image compression rate-distortion performances of five methods: BPG, VVC, Lee 19, Hu21, and GLLMM. Each method's performance is represented by two vectors: a rate vector that includes various bit rates, and a distortion vector that includes the corresponding Peak Signal-to-Noise Ratio (PSNR), measured by dB. Plot the performance of the five methods in one figure, using different line style, line width, color, and marker. 1) Adjust the plotting order of the five methods, so that order in the legend matches the performance order of the five curves in the figure. 2) Any two curves should have at least two different line properties. 3) The highest curve should be the widest. 4) The X label should be 'Bits/Pixel (BPP)'. 5) The Y label should be 'PSNR (dB)'. 6) Turn on grid. 7) Use the mouse to move the legend position so that it does not block the curves. Then use the File > Save As menu command in the figure window to save the figure as a PNG file. Submission Requirements: Submit your code and the PNG file. A Matlab file lab03plot.m is provided, which includes the image compression rate-distortion performances of five methods: BPG, VVC, Lee 19, Hu21, and GLLMM. Each method's performance is represented by two vectors: a rate vector that includes various bit rates, and a distortion vector that includes the corresponding Peak Signal-to-Noise Ratio (PSNR), measured by dB. Plot the performance of the five methods in one figure, using different line style, line width, color, and marker. 1) Adjust the plotting order of the five methods, so that order in the legend matches the performance order of the five curves in the figure. 2) Any two curves should have at least two different line properties. 3) The highest curve should be the widest. 4) The X label should be 'Bits/Pixel (BPP)'. 5) The Y label should be 'PSNR (dB)'. 6) Turn on grid. 7) Use the mouse to move the legend position so that it does not block the curves. Then use the File > Save As menu command in the figure window to save the figure as a PNG file. Submission Requirements: Submit your code and the PNG file.