Finger notation

[Propulsas]

Can anyone tell me what the lines under the fingering numbers are in this piece?

 

[Zevy]

Can anyone tell me what the lines under the fingering numbers are in this piece?

From Wikipedia: tenuto (Italian, past participle of tenere, "to hold"), denoted as a horizontal bar adjacent to a note, is a direction for the performer to hold or sustain a note for its full length.

 

[PhiliGol]

The lines are not in relation with the fingering but the notes itself.
A line means tenuto while a dot indicates a staccato note.

 

[Propulsas]

Thank you both for the clarification. I understand now.