Fix bug when plotting functions with underscores in labels

9 jobs for develop in 33 minutes and 8 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Test
passed #716165
test integration:3.6

00:01:23

passed #716166
test integration:3.7

00:01:23

passed #716164
test integration:latest

00:01:23

passed #716162
test unit:3.6

00:01:40

passed #716163
test unit:3.7

00:01:24

passed #716161
test unit:latest

00:01:44

passed #716168
test validation:3.6

00:32:10

passed #716169
test validation:3.7

00:33:06

passed #716167
test validation:latest

00:25:24