[Gretl-devel] (recession) bars in plots broken with annual data?

Hello once more, I was trying to get some shaded bars similar to recession bars with the usual plotting GUI apparatus, but in the context of annual data. I created pure text files with pairs of dates (years) as instructed; the contents is like this: 2015 2016 2018 2019 2021 2022 Gretl did not accept this, however, saying the format specification isn't met. Then I thought the years could be mistaken for plain obs numbers, so I tried the index numbers instead (the dataset has 11 obs): 3 4 6 7 9 10 Same error message. Is the "bars" facility perhaps not really hooked up or supported for annual data? thanks sven