How to adjust legend spacing between different legend entries for same legend group?

Hi

For same legend group, how to adjust legend spacing between different legend entries? For example, below legends for each different times, all these legends are in same group, the spacing is too big, can I make gap or spacing smaller?

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anyone has an idea on this? I googled for few days and I cannot find an answer. The only answer is using legendtracegroupgap, which is for different legend group. For my case, it belongs to same legend group. How to do it? Thanks

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I donαΊ— think there is a way to control this spacing, unfortunately.