Update sample.md

ec-jrc · Oct 15, 2024 · 947829b · 947829b
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@@ -12,6 +12,7 @@ Subset of one or more [entities](../entity).
 
 ### Notes 
 - The subset may be spatial, temporal, spectral, or in any other dimension or [trait](../trait).
+- The subset is contiguous, i.e. it does not consist of more than one discontinuous intervals along any dimension.
 - The process of obtaining a sample is called sampling.
 
 ### Examples