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.

Economists predict rebound, bot no job growth. - Quelle: Wall Street Journal, 07.02.2003.
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.

Paint besides.

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.