Currency pair AUD-USD was moving upwards it the up trend channel. This move formed a few important price zones which are easily visible. As you can see on H4 time frame, there was a break of the bottom line of uptrend channel. Now the price is moving around important support, which is one of our reasons to open short position. After the break of trend channel line, the established trend is over, so we think this is the right time to place short position.
Trend Analysis

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