"optionally available" is a correct and usable phrase in written English.
You can use it when something is available to be accessed or used, but can also be left aside or not used. For example, "The upgrade to the system is optionally available to all users."
Some shows on Hulu, for example, are optionally available in 480p format.
For orientation/alignment in possible simulation box compartments corresponding tags should be optionally available to be attributed to specific fragments.
The cradle connects to the audio system either via the optionally available Media Interface or the retrofittable iPod®Interface Kit available from the range of genuine accessories.
That tagliatelle is a highlight, optionally available in spinach or red pepper varieties and topped best with a couple of hulking meatballs.
Supplementary insurance policies including dental and cosmetic care are optionally available.
Supplementary insurance policies (e.g. for dental and cosmetic care) are optionally available.
First, although enrolled prospectively onto a randomised trial and treated homogeneously with cisplatin-radiotherapy, tissue was collected optionally and available for only 90/204 patients (44%).
Optionally, publicly available datasets in AE can be re-analysed by providing the function with the experiment's accession number, upon which all raw data files and relevant metadata will be downloaded from the AE Archive and the European Nucleotide Archive.
Find, and optionally download, publicly-available Chandra ObsIds from the Chandra archive.
The new statistical filtering presented here has already been made available in WEBCOCON, optionally only the filtered results of runs of the structure generator may be exhibited.
The use of biomarkers to enhance certainty of AD is described presently as useful in three circumstances: investigational studies, clinical trials, and optionally where the biomarkers are available and deemed appropriate by the clinician.
