Results are in clean files. I want to get them to latex-table format with paste.

1. So how can I have a delimiter "\t&\t"?
2. or is there some Latex tool?

Pasting Columnwise to have \t&\t delimiter

$ paste -d'\t\&\t' d d_powered_-2 rad
5.0 400.0&384.5
7.5 204.1&184.5
10.0        100.0&115.5
15.0        44.4&58.2
20.0        25.0&45.0
25.0        16.0&38.8
30.0        11.1&33.3
35.0        8.2&34.4
37.0        7.3&34.1
40.0        6.2&34.1
$ paste d d_powered_-2 rad
5.0         400.0   384.5
7.5         204.1   184.5
10.0        100.0   115.5
15.0        44.4    58.2
20.0        25.0    45.0
25.0        16.0    38.8
30.0        11.1    33.3
35.0        8.2     34.4
37.0        7.3     34.1
40.0        6.2     34.1