Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_17773 ( "Sequencer" text, "Ion Torrent PGM" text, "454 GS FLX" text, "HiSeq 2000" text, "SOLiDv4" text, "PacBio" text, "Sanger 3730xl" text )

### Question ###
What is the sequencer when ion torrent pgm is 200-400 bp?

### Accurate SQL ###

SELECT "Sequencer" FROM table_17773 WHERE "Ion Torrent PGM" = '200-400 bp'