Too much , but you are making someone ' s day with that amount . Go for 20 THB for small services . As for restuarant or other service , there is no hard rules . We normally just leave some coin from the changes you get after you paid . For example , after you paid for something and get 210 THB back , leave that 10 baht coin . <| sep |> Also be aware that depending on the settings used for generating the original BAM you might not get all of the original data in your fastq files . Many alignment programs don ' t report the unaligned data in the results , so doing the processing this way may not give exactly the same results as starting from the raw data . We ' ve seen this a few times in publicly deposited datasets where the deposited data has suspiciously excellent QC !