Display only authors

<?php
$user_query = new WP_User_Query( array( 'who' => 'authors' ) );
if ( ! empty( $user_query->results ) ) {
	foreach ( $user_query->results as $user ) {
		echo '<p>' . $user->display_name . '</p>';	//display name of user with role Administrator
	}
} else {
	echo 'No users found.';
}
?>

<?php

$user_query = new WP_User_Query( array( 'who' => 'authors' ) );

if ( ! empty( $user_query->results ) ) {

foreach ( $user_query->results as $user ) {

echo '<p>' . $user->display_name . '</p>'; //display name of user with role Administrator

}

} else {

echo 'No users found.';

}

<?php
$args = array(
	'meta_key'     => 'user_level',
	'meta_value'   => '0',
	'meta_compare' => '!=',
	'blog_id'      => 0
);
$user_query = new WP_User_Query( $args );
if ( ! empty( $user_query->results ) ) {
	foreach ( $user_query->results as $user ) {
		echo '<p>' . $user->display_name . '</p>';	//display name of user with role Administrator
	}
} else {
	echo 'No users found.';
}
?>

<?php

$args = array(

'meta_key' => 'user_level',

'meta_value' => '0',

'meta_compare' => '!=',

'blog_id' => 0

);

$user_query = new WP_User_Query( $args );