What is Meant by Eluting with 1-2% EtOAc/pentane in Terms of Flash Chromatography?

I am reading the experimental section of a paper, and it states

[compound of interest] Isolated as a pale yellow oil after flash chromatography on silica gel, eluting with 1-2% EtOAc/pentane...

This is all this paper states in regards to the work-up procedure. I fully understand everything in this section except what is meant by 1-2% EtOAc/pentane. Does this mean that in total only 1-2% by volume of ethyl acetate is used compared to the amount of pentane used in the flash chromatography? This could also mean that a solution of 1-2% ethyl acetate in pentane was used throughout the entire run (which I find most likely). Which of these interpretations is most likely? Would this mean the author of the paper did not change the polarity of the solvent during chromatography and only use a 1-2% EtOAc in pentane solution?

Here is the DOI to the paper: 10.1039/c6ob01026a