Question : awk shell script parameters

I have a bunch of numbers in a text file
tl@NewWest:~/pas$ head e6
1 491633.998 5457453.139 62.269
2 491632.579 5457455.151 62.410
3 491632.561 5457455.489 62.102
4 491629.344 5457454.188 62.249
...

the command
tl@NewWest:~/pas$ cat e6|awk '{print 11" " $1}'
produces
11 1
11 2
11 3
11 4
11 5
...
which is the required result
Now - when I try the same thing from within a script file
#!/bin/bash

MONPTS_ARRAY='1 2 16'

for MONPT in $MONPTS_ARRAY; do
cat e6|awk '{print $MONPT " "$1}'
done
exit 0

I get
1 491633.998 5457453.139 62.269 1
2 491632.579 5457455.151 62.410 2
3 491632.561 5457455.489 62.102 3
4 491629.344 5457454.188 62.249 4
5 491648.571 5457488.991 62.123 5
...

For some mysterious reason awk wouldn't recognize the $MONPT parameter and substitute it with a whole line of the file

Any ideas how to make this work?

Answer : awk shell script parameters

awk '{print '$MONPT' " "$1}'