The phrase "slightly fluctuate" is correct and usable in written English.
You can use it to describe something that changes slightly over time. For example, "The temperature of the room slightly fluctuates throughout the day."
The peaks of the amplitude-frequency characteristic slightly fluctuate when the branch number increases.
Because the plots in Figure 5 slightly fluctuate, it is hard to fit them using a simple straight line or a curve.
However, Poisson's ratio ν 12(diamonds) and ν 21 (stars) of V-MoS2 sheets slightly fluctuate as the temperature increases, in which the maximum amplitude does not exceed 2%%.
In subgroup 7, which contains 51 TFs, expression levels began to rise or slightly fluctuate from 0 to 2 hours cold stress treatment.
Even so, the T_score of some individual ORFs may slightly fluctuate in some cases, hence we advise the users to perform the program more than one times (five in the present paper) and determine those ORFs with T_score <0 whose occurring times equal or more than a given threshold (three in the present paper) as non-coding.
Then, early Thursday morning, came the real logo: "Yahoo!" written in capital sans-serif letters of slightly fluctuating sizes and an exclamation point slanting to the right.
Similar as the economy, Australia's performance slightly fluctuated, but still kept at a high level.
The variation coefficient of emitter discharge rates is slightly fluctuating around a certain value within the whole pressure range.
The results will be slightly fluctuated but will not affect the the overall trend of the experiment.
It was observed that Ti C:H and Si C H coatings deposition rates slightly fluctuated within the whole range of an acetylene flow applied.
Before intensive mining, changes of landscape tend to be smooth or slightly fluctuated, having different running tracks in scales of grain sizes compared with those in mining-intensively periods.
