Enhancing the Quality of the Characteristic Transmittance Curve in the Infrared Region of Range 2.5–7 µm of the Optical Magnesium Fluoride (MgF₂) Ceramic Using the Hot-Pressing Technique in a Vacuum Environment

Table 6

The regression function coefficient values.

b0	b1	b2	b3	b12	b13	b23	b11	b22	b33
72.27	4.77	2.52	2.67	0.00	2.63	−3.38	−6.84	−4.81	−5.15