Looking into the future is hard. Look: Forecast down, remained the same. Forecast down again, gone up. Forecast up, gone down. Forecast a little down, gone down a lot. And so on and on. Up and down.
Source: Wall Street Journal, 2003-02-07.
Therefore: If you forecast, say that. Clearly. There are a lot of nice means to do so:
Paint in the front.
Fill and paint besides
Paint a box around
Very important for lines: How many points have you forecast?
The climax: Paint range
So always mark. Because: Unmarked speculation is manipulation.