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use "$rostopic echo /turtle1"

you must use ~~"$rostopic echo /turtle1"~~it in this form

rqt_plot /topic1/field1

To graph multiple fields of a message:

rqt_plot /topic1/field1:field2:field3

To graph the data all on the same plot:

$ rqt_plot /topic1/field1,/topic2/field2

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