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<?php $image = get_sub_field('NOMBRE_SUB_FIELD'); if( $image ): ?>
<img data-interchange="[<?php echo $image['sizes']['CUSTOM_SIZE']; ?>, small], [<?php echo $image['sizes']['CUSTOM_SIZE']; ?>, medium], [<?php echo $image['sizes']['CUSTOM_SIZE']; ?>, large]">
<?php endif; ?>