(TXT) Source: Dying high-mass stars
       
        .                                                  ..
        .. ..                               .  .  .  O  F  Ne
        Na Mg                               Al Si P  S  Cl Ar
        K  Ca Sc .. .  .. .. .. .. .. Cu Zn Ga Ge As Se Br Kr
        Rb .. .  .. .. .. .. .. .. .. .. .. .. .. .. .. .  ..
        .. .. .. .. .. .  .. .. .. .. .. .. .. .. .. .. .. ..
        .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ..
                                                             
              .. .. .. .. .. .. .. .. .. .. .. .. .. ..      
              .. .. .  .. .. .. .. .. .. .. .. .. .. ..      
       
 (DIR)   8 O  Oxygen
 (DIR)   9 F  Fluorine
 (DIR)  10 Ne Neon
 (DIR)  11 Na Sodium
 (DIR)  12 Mg Magnesium
 (DIR)  13 Al Aluminum
 (DIR)  14 Si Silicon
 (DIR)  15 P  Phosphorus
 (DIR)  17 Cl Chlorine
 (DIR)  19 K  Potassium
 (DIR)  21 Sc Scandium
 (DIR)  31 Ga Gallium
 (DIR)  32 Ge Germanium
 (DIR)  33 As Arsenic
 (DIR)  34 Se Selenium
 (DIR)  35 Br Bromine
 (DIR)  36 Kr Krypton
 (DIR)  37 Rb Rubidium
       
 (DIR) All Sources