Monotone Data Visualization Using Rational Trigonometric Spline Interpolation

Figure 5

𝐶¹ rational trigonometric bicubic function with 𝛼_𝑖,𝑗=14, 𝛽_𝑖,𝑗=15, 𝛾_𝑖,𝑗=6,  𝛿_𝑖,𝑗=7,  𝛼_𝑖,𝑗+1=8,  𝛽_𝑖,𝑗+1=8,  𝛾_𝑖,𝑗+1=4, 𝛿_𝑖,𝑗+1=9,  𝛼_𝑖,𝑗=6, 𝛽_𝑖,𝑗=5,  𝛾_𝑖,𝑗=4,  𝛿_𝑖,𝑗=8, 𝛼_𝑖+1,𝑗=15,  𝛽_𝑖+1,𝑗=2,  𝛾_𝑖+1,𝑗=12,  𝛿_𝑖+1,𝑗=8.