"upper figure" is correct and usable in written English.
You can use it to refer to a numerical value that is larger than a previously mentioned value. For example, "We expect the profits to be in the high tens of millions, but our upper figure is $50 million."
The ACIS-I array consists of chips I0-I3 (shaded gray in the upper figure).
(Upper figure) The vertical black lines represent frequencies of the fundamental spheroidal modes based on the Preliminary Reference Earth Model19.
The upper figure, $144 million, is equal to about one-sixth of DNO's total market value.
The upper figure (numerator) shows the number of turns in the helix, and the lower (denominator) the number of leaves embraced in the cycle.
The Personal Health column on Nov. 1, about osteoporosis, misstated the upper figure for the range of bone density measurements that defines osteopenia, a condition that may precede osteoporosis.
As the scholar Bina D'Costa points out, for the Bangladesh government, an upper figure gave the new country greater legitimacy; for the Pakistanis, to scoff and diminish allowed them to demonstrate an ongoing distrust.
In Western musical notation the number of beats to the measure is indicated by the upper figure of the time signature at the beginning of a musical composition, while the time value of each separate beat (e.g., a quarter or eighth note) is indicated by the lower figure.
The upper figure shows the LSFM value and the corresponding adaptive threshold for each frame.
Flow height map (upper figure) and velocity map (lower figure) of the Valtellina valley.
The lower figure is the cross section corresponding to the gray rectangle in the upper figure.
Small circles at the tips of arrows in the upper figure indicate the estimation errors.
