أرسل هذا في رسالة قصيرة: Relative efficiencies of different filters in retaining phytoplankton for pigment and productivity studies

 _    _    _    _    __   _     _____     _____   
| |  | || | || | || | || | ||  |  ___||  |__  //  
| |/\| || | || | || | '--' ||  | ||__      / //   
|  /\  || | \\_/ || | .--. ||  | ||__     / //__  
|_// \_||  \____//  |_|| |_||  |_____||  /_____|| 
`-`   `-`   `---`   `-`  `-`   `-----`   `-----`