Traditional　Lorch-window　technique　was　modified　to　the　truncated　Lorch-window　through　various　truncation　ranges　to　apply　the　Lorch-window　functions.　The　terminal　ripples　in　radial　distribution　functions　(RDFs)　were　weakened　and　the　shoulder　peak　at　2.6　angstrom　in　crystalline　Ge2Sb2Te5　(GST)　was　revealed　by　the　indication　of　the　off-octahedral　Ge.　The　Cs-corrected　high　resolution　transmission　electron　microscopy　image　and　the　corresponding　simulations　suggest　that　the　off-octahedral　Ge　atoms　are　indeed　in　the　tetrahedral　symmetry.　These　results　indicate　that　the　complex　structural　details　in　the　intermediate　phase　of　GST　other　than　simple　rock-salt　structure　though　the　quantified　information,　such　as　the　accurate　atomic　positions　of　the　off-octahedral　Ge　need　being　further　clarified　in　the　future.　These　results　also　reveal　the　significance　of　high-Q　signals　in　revealing　the　structures　in　short　range　order.　Left　(a):　Original　reduced　interference　function　F(Q)　(black)　and　truncated　F(Q)　data.　Right　(b):　Corresponding　RDF　curves.　L-12　(red　half-solid　triangle)　represent　the　data　with　a　truncation　range　of　12　angstrom-1,　and　L-16　(open　square)　for　the　truncation　range　of　16　angstrom-1.