Reading a text file

[browny]

Hi, I am trying to read some data from a text file with each column as a
separate array. Im not really sure how to do it as it contains text, numbers
plus other characters.

The data I am trying to read can be found here
http://astronomy.swin.edu.au/ska/Research/1718-fluxes.txt

With the data it is currently in the form "3.915+/-0.017". I would like to
read this into two separate arrays, one containing the "3.915" the other
containing "0.017"...as numbers, not strings.

Some of the fields contain "-------------" instead of a value like the one
above and I would like this to be read as an empty value so I can plot the
data without it being assigned to the wrong x value.

Thanks for any help or advice you can give.
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