observationArc

Given a predicate that represents a relationship or action between entities, generate a one-sentence description explaining its meaning.  
# Instructions
Focus on describing the relationship, not the entities themselves. 
# Response Format
Begin the description with \' Indicates...\'

Predicate: observationArc

Indicates a relationship where one entity serves as an observational link or span over which another entity is monitored, tracked, or measured across a period or range.