Hello. I have an idea about making a graph from notes about the singing of bird, in the dawn.
I make it a little like a relational database (I think). The three column headers are date, time, level (1-3).
First row is 2020-04-26, 02:45, 1
2:nd row is 2020-04-26, 02:54, 1
3:rd row is 2020-04-26, 03:20, 1
4:th row is 2020-04-27, 03:13, 1
5:th ... 2020-04-28, 02:57, 2
6:th ... 2020-04-30, 02:51, 1
7:th ... 2020-05-01, 2:55, 1
8:th ... 2020-05-01, 03:31, 3
9:th ... 2020-05-02, 02:52, 1
and so on, some have level 3 also.
From the example here I was thinking that three lines (from 26:th of April) meet at a single point at 27:th, then goes to the the 'sibling'-point at 30:th of April, then 1:st of may, then 2:nd of may.
One line goes for all the level-1-entries, but can be split into several lines and then joined.
Another line goes through all level-2 entries
Same for level 3-entries
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