text: -- ppm per sample
  DROP TABLE IF EXISTS protein_sample_ppm;
  CREATE TEMPORARY TABLE protein_sample_ppm
  SELECT 
  	entry, sample_index, ROUND(AVG(ppm),2) as ppm
  FROM
  	finalquant_extended
  GROUP BY
  	entry, sample_index
  ;
  ALTER TABLE protein_sample_ppm ADD INDEX(entry);
  ALTER TABLE protein_sample_ppm ADD INDEX(sample_index);
  
  
  