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Energy landscape theory provides a framework for resolving important contemporary issues observed in the dynamics and thermodynamics of complex systems.Recent experimental developments in single-molecule spectroscopy have provided us with several insights not only the distribution of the molecular properties but also the dynamical information at single molecule level buried in the ensemble-averaged measurements.In fluorescence resonance energy transfer experiments, what one can observe is, for example, fluorescence from donor (D)/acceptor (A)molecules embedded in single proteins as a function of time.Such physical quantities are expected to trace the change in the D-A distance at the single molecule level.The complexity in kinetics observed in single molecule measurements arises from the morphological feature inherent to the underlying multidimensional free energy landscape of the system."What can one deduce or extract solely from scalar single molecule time series about the morphological properties of the underlying multidimensional free energy landscape?" This is the central question to be addressed in this article.