#! /usr/bin/awk -f

# Takes a micrographs_ctf.star file from RELION and excludes all rows that have

# a rlnCtfMaxResolution worse than the value of the resolution= parameter

# provided on the command line.

# Usage:

# exclude_low_res_micrographs.awk resolution=<n> micrographs_ctf.star > new_file.star

# in which <n> is the resolution cut-off (only micrographs with better or equal

# resolution will be kept).

# Keep all metadata lines.

NF <= 4 {

print;

}

# Keep rows for which rlnCtfMaxResolution is better than or equal to the

# resolution= parameter passed on the command line.

NF > 4 {

# rlnCtfMaxResolution is the 13th field in micrographs_ctf.star files from

# RELION-3.0. Change this if your version of RELION orders columns of star

# files differently.

rlnCtfMaxResolution = $13;

if (rlnCtfMaxResolution <= resolution) {

print;

}

}