hasApproximateNeutralHydrogenColumnDensity

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: hasApproximateNeutralHydrogenColumnDensity

Indicates that an entity is associated with an estimated, not precisely measured, value for its column density of neutral hydrogen along the line of sight.