The rm_footnotes() function

Use sza to create a gt table. Color the sza column using the data_color() function, then, use tab_footnote() twice to add two footnotes (each one targeting a different column label).

gt_tbl <-
  sza |>
  dplyr::filter(
    latitude == 20 &
      month == "jan" &
      !is.na(sza)
  ) |>
  dplyr::select(-latitude, -month) |>
  gt() |>
  data_color(
    columns = sza,
    palette = c("white", "yellow", "navyblue"),
    domain = c(0, 90)
  ) |>
  tab_footnote(
    footnote = "Color indicates height of sun.",
    locations = cells_column_labels(
      columns = sza
    )
  ) |>
  tab_footnote(
    footnote = "
    The true solar time at the given latitude
    and date (first of month) for which the
    solar zenith angle is calculated.
    ",
    locations = cells_column_labels(
      columns = tst
    )
  ) |>
  cols_width(everything() ~ px(150))

gt_tbl

tst1	sza2
0700	84.9
0730	78.7
0800	72.7
0830	66.1
0900	61.5
0930	56.5
1000	52.1
1030	48.3
1100	45.5
1130	43.6
1200	43.0
1 The true solar time at the given latitude and date (first of month) for which the solar zenith angle is calculated.
2 Color indicates height of sun.

If you decide that you don’t want the footnotes in the gt_tbl object, they can be removed with the rm_footnotes() function.

rm_footnotes(data = gt_tbl)

tst	sza
0700	84.9
0730	78.7
0800	72.7
0830	66.1
0900	61.5
0930	56.5
1000	52.1
1030	48.3
1100	45.5
1130	43.6
1200	43.0

Individual footnotes can be selectively removed. Footnotes are identified by their index values. To remove the footnote concerning true solar time (footnote 2, since it was supplied to gt after the other footnote) we would give the correct index value to footnotes.

rm_footnotes(data = gt_tbl, footnotes = 2)

tst	sza1
0700	84.9
0730	78.7
0800	72.7
0830	66.1
0900	61.5
0930	56.5
1000	52.1
1030	48.3
1100	45.5
1130	43.6
1200	43.0
1 Color indicates height of sun.