#!/usr/bin/perl

use strict; # https://perlmonks.org/?node_id=11143808
use warnings;

printf "%-13s%15.6f%15.6f %s\n" x 2, split, '', split ' ', <DATA>
  while <DATA>;

 __DATA__
MM_STD_gate -61.771653             -45.472441      mils
  -1569.000000           -1155.000000       microns
RFN_a                    -91.102362              68.307087      mils
                    -2314.000000            1735.000000       microns
RFN_b                    -62.165354              68.307087      mils
-1579.000000            1735.000000      microns
RFN_c                    -51.417322              68.307087      mils
                              -1306.000000            1735.000000     
+  microns
[download]

Outputs:

MM_STD_gate       -61.771653     -45.472441 mils
                -1569.000000   -1155.000000 microns
RFN_a             -91.102362      68.307087 mils
                -2314.000000    1735.000000 microns
RFN_b             -62.165354      68.307087 mils
                -1579.000000    1735.000000 microns
RFN_c             -51.417322      68.307087 mils
                -1306.000000    1735.000000 microns
[download]