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Singular value decomposition (SVD) of the fast imaging data of plumes in the laser-blow-off experiment at various background gas pressures is analyzed. It has been observed that structures in the plasma plume are developed not only at the edge but also inside the plume. The principal components based on eigenvectors clearly show the dynamics of plume and its structures both in the longitudinal and lateral directions. SVD analysis is proved to be much clear and better representation than the spectroscopic measurement to show the behavior of expanding plumes, particularly its internal structures in the presence of different ambient environment.