Huge volum after market closed?

Needless

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Hi, and sorry if the question is dumb. Just trying to learn.

I watched a stock on nasdaq.com.

During the day I watched a board who listed the 5 last trades.

Example:

13:01:10 - $ 1.60 - 200 shares
13:01:30 - $ 1.59 - 300 shares
13:01:50 - $ 1.60 - 210 shares

The stock continued down during the day.

Then I took a look on the after market last sales

16:23:00 - $ 1.56 - 36.338 shares

According to a free charting software i use the major support line was about $ 1.57. What does this huge rise in volum mean? Or how can I interpret it?
 
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