Each file corresponds to different conditions as follows:

run 1: represents unpollinated pistil 28 (SRA record SRR30982324)
run 2: represents unpollinated pistil 37 (SRA record SRR30982322)
run 3: represents pollinated pistil 28 (SRA record SRR30982328)
run 4: represents pollinated pistil 37 (SRA record SRR30982326)

The data (run 1 - run 4) were uploaded to the Sequence Read Archive (SRA)
under project accession SRP538407.

See:

https://www.ncbi.nlm.nih.gov/sra/SRP538407